IF YOU’VE EVER posted a photograph on the huge group science mission referred to as iNaturalist and puzzled how such contributions get utilized in analysis… nicely, as we speak’s visitor is right here to inform us about one particularly beautiful instance. It includes 1.6 million such crowd-sourced observations, and the timing of the migration of hummingbirds in Japanese North America.
You’ve most likely heard it mentioned that hummingbirds love crimson flowers, and scientists within the Hopkins Lab on the Arnold Arboretum of Harvard College took a a lot nearer take a look at that connection due to all that group information, and the usage of synthetic intelligence to kind by way of all of it.
One of many Harvard scientists, a post-doctoral researcher within the plant evolution lab named Patrick McKenzie, a part of the group at Dr. Robin Hopkins’s lab, is right here to elucidate what they realized and the way.
Patrick has written that, “Quiet hours within the solar, meditating with the bugs, vegetation, and birds, are my inspiration as an evolutionary biologist.”
He’s all the time looking out for patterns—after which asking himself why every sample unfolds—just like the why of crimson flowers and hummingbirds, for instance. In addition to his in depth coaching in plant evolution, Patrick is a eager birder, and I used to be glad for the possibility to speak with him.
Learn alongside as you hearken to the June 1, 2026 version of my public-radio present and podcast utilizing the participant beneath. You’ll be able to subscribe to all future editions on Apple Podcasts (iTunes) or Spotify (and browse my archive of podcasts right here).
hummingbirds and crimson flowers with patrick mckenzie
Obtain file | Play in new window |
Subscribe: Apple Podcasts | Spotify
Margaret Roach: Sure. So on a non-hummingbird matter—nicely, it could be hummingbird matter, however a non-red flower matter—I’ve learn that your favourite wildflower species is Monarda fistulosa, the wild bergamot or bee balm, and that you just spent many hours watching bumblebees forage from its lavender-colored flowers. In order that’s one in all your favourite observations that you just prefer to go watch?
Patrick McKenzie: Yeah, positively. Yeah. Monarda fistulosa is one which I grew up round in Arkansas and it’s sort of adopted me my entire life. So now there’s a large patch of it subsequent to the constructing the place I work. And so within the summertime, truly beginning in only a few weeks, the Monarda fistulosa will probably be blooming right here. And yeah, watching the pollinator interactions with them is actually, actually superb as a result of they’re visited by bumblebees very clearly, however for those who stand round and watch lengthy sufficient, you’ll see all kinds of various insect guests; often hummingbirds, too, come by to go to these flowers.
Margaret: Yeah. So how did the query in regards to the generally repeated notion that hummingbirds favor crimson and I feel tubular and nectar-rich flowers, how did that type of query get in your radar as one thing to look deeper into on the lab? After which that led to the publication, I imagine it was final Might within the journal “Present Biology,” of your analysis. So have been you watching hummingbirds or crimson flowers or what occurred? [Laughter.]
Patrick: Effectively, yeah, there are some things. So the idea of what makes a “hummingbird flower” is one thing that scientists have talked about forwards and backwards within the literature for a very long time. And whether or not it’s really a crimson flower choice for hummingbirds; whether or not that sample that crimson flowers are extra usually hummingbird flowers, whether or not that’s true to start with.
After which additionally there are these different bodily traits which might be frequent in hummingbird flowers, we expect—like having a tubular form, like trumpet-shaped flowers, and being wealthy in nectar—that scientists have been making an attempt to review at giant scales for a very long time.
I feel for us, there’s this remark that for those who observe the flowering time or the phenology, the seasonality, of when flowers are showing in nature up the Japanese U.S., I feel a easy remark that was motivating for us is that flowers are showing within the Japanese U.S. earlier than hummingbird migration has occurred. So there’s this couple-of-week-long interval I feel in late March or early April, proper earlier than hummingbirds have moved as much as say Virginia, New York, the place I’m in Massachusetts, the place flowers are blooming, however the birds aren’t right here but. And so I’ve this concept that if that is true, most likely these hummingbird flowers are going to be underrepresented among the many flowers that we see. And possibly we gained’t be seeing many of those crimson or orange tubular, nectar-rich flowers.
Margaret: O.Okay. In order that acquired you questioning, nevertheless it wasn’t like you could possibly get 9 million researchers [laughter] to go man the coast all the way in which from the overwintering grounds to the breeding grounds for a month or one thing or a number of weeks or perhaps a week. I imply, how do you presumably … So that you had this concept of how you could possibly presumably accomplish this.
Patrick: Proper. Yeah. So there’s this historical past of those phenology research being executed, these research of seasonality at native scales. So you could find inside say a state park or one thing, a botanist would’ve recorded the flowering phenology, the flowering time, of those completely different plant species and printed that within the literature. And so there was a few of that extremely localized info.
However in parallel to all of this, I’ve been getting an increasing number of fascinated with iNaturalist, this group science or—I name it group science, different individuals name it citizen science or participatory science. It’s all referring to those platforms by which anybody can stroll round in nature with a cellphone and never have a science background however nonetheless be contributing helpful information. And iNaturalist is I feel one in all, if not the most well-liked platform by which individuals are usually participating with group science. And so I’m beginning to get actually excited simply in all points of the science I’m doing with the chance to make use of this information to review pure historical past at these actually large scales.
So such as you mentioned, yeah, it will be actually, actually tough to ship hundreds of researchers up and down the Japanese U.S. to trace when issues are flowering and the place hummingbirds are. However as a result of we now have individuals strolling round with their cellphones taking footage of vegetation and birds and importing them to iNaturalist, we will do it from our lounge sofa. Or in my case, within the constructing the place I work, I can take a look at observations from everywhere in the nation and everywhere in the world.
So sure, I feel in North America, there are tens of millions of observations of flowering vegetation and that supplied a extremely superb dataset for us to dive into for this mission.
Margaret: And now you didn’t actually sit in your lounge sofa going by way of the items of knowledge. [Laughter.] You truly did one thing much more forward-thinking and fashionable, which is I feel you used synthetic intelligence to assist do the evaluation. Is that appropriate?
Patrick: Proper, that’s appropriate. And truly, this concept is one thing that I initially had most likely… I feel I began making an attempt to work on this with some buddies throughout my PhD 5 – 6 years in the past. And on the time, synthetic intelligence as a chance for information processing wasn’t actually on our radar in any respect. And on the time I took a bunch of individuals and a large spreadsheet and tried to subdivide the work of manually labeling flower colours throughout the spreadsheet amongst eight or 10 individuals, one thing like that. And I used to be like, if all of us spend 10 hours clicking rows, possibly we will come out with an information set of like 10,000 label observations and possibly that may be sufficient to review this phenomenon.
After which quick ahead to I feel late 2023 is after I was in a position to revisit this mission and ChatGPT had simply matured in sort of a brand new approach. They’d simply launched this computer-vision mannequin, and laptop imaginative and prescient is one thing that I feel is famously laborious for doing advanced duties however actually excels at quite simple duties.
And so the sort of query that I had been asking up up to now was iNaturalist observations and asking what flower shade I’m in a given picture. And that is the precise sort of query that one thing just like the ChatGPT imaginative and prescient mannequin is actually, actually good at performing, answering quite simple questions after which doing that many occasions. And so I used to be in a position to come again to this dataset and slightly than making an attempt to rope in a bunch of individuals to only assemble a small dataset, abruptly I may flip the pc unfastened on this dataset of what ended up being a dataset of 1.6 million observations.
And for each remark, we will ask this quite simple query of there’s a flower on this picture out of this checklist of colours, yellow, blue, inexperienced, crimson, what shade is the flower that you just’re seeing? And scaled up massively, that turns into a really wealthy supply of knowledge that people have a really tough time assembling.
Margaret: And so we all know additionally from different observations, we all know the place the hummingbirds are, from the migration stories and so forth.
Patrick: Yeah.
Margaret: As a result of I assume possibly we must always say that hummingbirds, they’re not simply taking nectar, in addition they act as pollinators to a few of these vegetation too. Is that appropriate? There’s a two-way relationship.
Patrick: That’s precisely proper. Yeah. The vegetation present a service to the hummingbirds and the hummingbirds present a service to the vegetation. And it’s thought that this specialization of those bodily traits of the flowers of being crimson and of being tubular and of being nectar wealthy are sometimes extra to the flowers’ profit. I feel particularly the specialization on crimson is regarded as the vegetation specializing to the hummingbirds.
There’s been some earlier work displaying that hummingbirds are actually nice learners, and if they’re in an setting the place there aren’t crimson and orange flowers that they’ll study to seek out nectar in flowers of different colours, and that this crimson shade that the flowers take assist them stand out to the hummingbirds to the exclusion of issues like bumblebees. To allow them to specialize very well on hummingbird guests for pollination. After which the hummingbirds assist vegetation cross-pollinate with each other, which helps preserve variety for the vegetation.
However sure, getting again to your authentic query, hummingbirds are additionally very frequent within the iNaturalist dataset. They’re additionally tracked individually. There’s a separate community-science platform referred to as eBird that has a great deal of details about hummingbird migration as nicely. For simplicity for this paper, we simply used the iNaturalist dataset, however we did verify informally to see that there’s actually good concordance in each datasets for monitoring this northward development of hummingbird migration.
Margaret: So right here you’ve gotten all this information, it’s getting analyzed by AI and it’s all … And what did you discover out? As a result of once more, I’ve heard for years, “Oh, they like crimson flowers,” and there could also be some correlation to their migration patterns or no matter. Individuals say issues (however generally it appears like a bit little bit of typical knowledge or an outdated wive’s story) like, “Oh, they arrive on the time of such and such flower.” However not essentially backed up by analysis. So what did you discover out? [Above, Monarda didyma, scarlet bee balm, with red tubular flowers.]
Patrick: Yeah, so what we discovered was one thing that to me is actually delightfully easy, which is that for those who simply overlook in regards to the species id of all of those completely different flowers, for those who simply take these 1.7 million observations and also you break them down into colours—crimson, blue, inexperienced, yellow—we see this type of good wanting concordance in flowering time for every part that’s not crimson and orange flowers.
So principally early within the 12 months, all of those completely different colours begin flowering within the Southern United States within the Japanese half of the nation. After which all through the spring, this flowering advances northwards. So we now have early within the 12 months, every part’s blooming within the South. Later within the spring, by Might and by June, flowers are peaking within the Northeast. After which crimson and orange actually stand out as lagging behind on this northward development. And so in March, in April when the hummingbirds haven’t but arrived, there are principally no crimson and orange flowers blooming within the Japanese U.S.
After which as quickly because the hummingbirds present up, we see this actually good correlation within the northward development of the Japanese U.S. of hummingbird migration alongside the place these red- and orange-colored flowers are showing.
And so it’s the primary time that this lag pushed by flower shade alone has been documented within the scientific literature. And as an evolutionary biologist, that is actually thrilling as a result of it suggests one thing a couple of generality. Generalities might be laborious to return by in evolution and in ecology, as a result of biology is simply so messy. However it suggests there’s this generality of a hyperlink between crimson and orange flowers whatever the evolutionary histories of those completely different species, and the time of the season at which they’re showing. And that’s we expect pushed by the looks of hummingbirds seasonally.
Margaret: So as a result of once more, relationship? As a result of over all these nonetheless many millennia, and so forth., and past— relationship, is that why? I imply, the 2 organisms—they’re not two, however you understand what I imply, the flowers of those colours and the hummingbirds. Do we all know that or—
Patrick: Yeah, I feel there’s nonetheless extra testing to be executed. So what we now have proper now, it’s a great correlation between the looks of the crimson and orange flowers and the looks of the hummingbirds, however I feel it’s actually extremely suggestive of a co-evolutionary relationship between these items. So there’s some dependence, proper, on hummingbird presence of success for these crimson and orange flowers and getting efficiently pollinated.
And yeah, I feel for tens of millions of years, they are going to have been constructing this relationship, and it’s contingent on the truth that hummingbirds are migratory. So this facet of flowering time is contingent on this fully separate taxon. Which for those who look throughout on the opposite facet of the nation on the West Coast like California, Anna’s hummingbirds are there 12 months spherical, and we don’t see this similar sample. And so it’s this strategy of migration within the ruby-throated hummingbirds within the Japanese U.S. that I feel is driving this.
Margaret: I sort of love that it’s ruby-throated and that it’s the crimson and orange flower [laughter]. I simply sort of love that. It’s all simply very styled. It’s very trendy. So among the flowers, simply as examples that on this palette [laughter] going up the nation, are there some that folks would acknowledge that as “hummingbird vegetation” sort of?
Patrick: Yeah, positively. Yeah, some fashionable backyard vegetation for native flower gardens: I feel Lobelia cardinals, cardinal flower [photo, top of page], is without doubt one of the most frequent within the dataset, in addition to Aquilegia canadensis, wild columbine. In the event you’re extra within the Southeast, Campsis radicans, the trumpet creeper, is a extra frequent orange flower. Later within the season we see jewelweed seem as nicely.
The dataset’s actually fascinating as a result of yeah, it’s dominated very a lot by a few of these very, very, I feel, frequent and showy flowers. I feel one thing that type of innately appeals to me about these questions of hummingbird pollination is that I feel the flowers which might be very enticing to hummingbirds are additionally the flowers which might be very enticing to me personally. So I consider these as being the showy, charismatic flowers which might be usually related to hummingbird pollination. [Above, wild columbine; photo from Wikimedia by Ragesoss.]
Margaret: Proper. And it’s fascinating, after all, now fascinated with it, I’m considering, nicely, you’re fully proper. I by no means considered it consciously. I imply, I all the time thought in regards to the a part of early spring is pastel-y, however I by no means thought in regards to the different half, dot, dot, dot, however the crimson and orange stuff comes later. I didn’t consider it precisely that approach. I considered what was current, not what was lacking.
Patrick: Proper, proper. Effectively, for the early spring stuff, and truly simply I feel wanting throughout the entire different ways in which a flower can look, there are different forms of pollination syndromes. So pollination syndrome is a phrase that’s referring as to whether one thing is a hummingbird flower or a bumblebee flower or a fly flower, these teams of traits which might be related to one sort of floral customer versus one other.
And so we’ve been speaking about this crimson and orange, tubular, nectar-rich flower for hummingbirds,. However there are additionally related sweets of traits with bumblebees, usually having recognizing on the petals [as above, with Monarda]; they usually have like a touchdown pad for the bumblebees to carry onto. Simply the type of generalities of the looks of those flowers. And in distinction, we now have for fly-pollinated flowers, we regularly have actually robust aromas. They’re usually white or generally like maroon or brown.
And so they’re additionally well-known hawk moth pollination syndromes, bat pollination, all of that are generalities as a result of these syndromes can come up type of throughout the tree of life and may look barely completely different in agave versus morning glory or one thing, however nonetheless you may see this development towards, oh, if it’s hawk moth pollinated, it could be white.
I feel what stands out right here is that there’s this lag, the seasonal lag, within the look of ruby-throated hummingbirds that we don’t see in bumblebees versus flies. I feel possibly we’d additionally see an identical distinction in flowering time of our bumblebee-pollinated issues and our fly-pollinated issues, besides I feel each of these teams of pollinators get, they turn out to be lively across the similar time of 12 months, and so we don’t see the identical lag there.
Margaret: It made me wish to ask about, does this expertise with this analysis executed this fashion utilizing this sort of information, do you now have a listing of all the opposite belongings you wish to discover this fashion [laughter]? Uh-oh. I feel laughing. I assume he does.
Patrick: It could actually spiral, can’t it? I feel sure, completely. I feel iNaturalist and group science basically is one thing that if we have been to awaken a botanist from 200 years in the past and present that individual iNaturalist and what it will possibly present as a useful resource for asking these sorts of pure historical past questions at giant scale, I actually assume it’d be completely mind-blowing for that individual.
It’s a treasure trove that I feel gives countless alternatives for questions in regards to the pure world. And so yeah, I’ve began digging in additional to particular organisms. So we introduced up Monarda fistulosa earlier and we now have a current paper out about exploring flower shade variation in Monarda fistulosa particularly. So slightly than asking are we crimson versus yellow versus blue, we’re asking, O.Okay., all of those flowers are typically lavender-colored, however is there variation in that shade throughout house? And in that mission, we discover that the entire Western Monarda fistulosa appear to be this richer, deeper lavender than these within the East. And so I’ve explored {that a} bit extra with extra of an organismal goal.
There are additionally new discoveries every single day with iNaturalist of latest species, or it may be used to trace the unfold of invasive vegetation, too. So I’m fascinated with these items as nicely.
I feel possibly within the quick time period, one thing I’ve been actually enthusiastic about exploring sooner or later is to truly flip to eBird, this different community-science platform, and flick thru the entire pictures of hummingbirds and attempt to assemble a listing or a map or one thing of if there’s a flower being visited by the hummingbird in that image, what sort of flower is that and might this community-science dataset additionally simply typically assist the concept this bodily affiliation of this crimson tubular flower actually does maintain up. Once more, I feel that is one thing that we typically know to be true, however each completely different aspect we will take to assist that I feel makes that generality extra convincing.
Margaret: And selfishly, I wish to say as a gardener, I all the time say to individuals, plant some “hummingbird flowers” close to your favourite home windows [laughter] as a result of there’s such little birds and so they’re quick and so forth, nevertheless it’s so unbelievable to look at them up shut, to have the privilege to look at them up shut. Are you aware what I imply?
Patrick: It truly is.
Margaret: I’ve some honeysuckle, Lonicera sempervirens, round a porch publish proper exterior my kitchen home windows and it’s identical to, I imply, simply watching is simply egocentric however great. So hopefully they’re as completely happy as I’m about it.
Patrick: Effectively, they’re so entertaining, proper?
Margaret: Yeah, precisely.
Patrick: I’ve lived close to Monarda didyma earlier than, the scarlet bee balm [above].
Margaret: Sure.
Patrick: And yeah, actually, actually related expertise. It could present a complete lot of leisure, particularly once you get a couple of hummingbird. It may be numerous enjoyable.
Margaret: Effectively, Patrick McKenzie, I’m so glad to speak to you and I used to be so glad that you just shared with me in correspondence and so forth lately this analysis and alerted me to this as a result of that is simply actually fascinating, each the method and what you realized. So thanks. And I hope I’ll discuss to you once more quickly, and completely happy birding meantime, proper?
Patrick: Yeah. Thanks a lot. It’s been a pleasure.
(Pictures by Patrick McKenzie besides as famous.)
choose the podcast model of the present?
MY WEEKLY public-radio present, rated a “top-5 backyard podcast” by “The Guardian” newspaper within the UK, started its seventeenth 12 months in March 2026. It’s produced at Robin Hood Radio, the smallest NPR station within the nation. Pay attention regionally within the Hudson Valley (NY)-Berkshires (MA)-Litchfield Hills (CT) Mondays at 8:30 AM Japanese, rerun at 8:30 Saturdays. Or play the June1, 2026 present utilizing the participant close to the highest of this transcript. You’ll be able to subscribe to all future editions on iTunes/Apple Podcasts or Spotify (and browse my archive of podcasts right here).
