#Florisuga mellivora

[na-bird-of-the-day]

BOTD: White-necked Jacobin

Photo: Doug Greenberg

"Rather large, spectacular hummingbird of humid tropical lowlands that favors forest edges, adjacent clearings with scattered trees and flowering bushes, and gardens. Feeds at all levels, often in the canopy, hovering with its tail cocked and occasionally opening it to show extensive white. Male has deep blue hood, green upperparts with white collar (often hard to see), white underparts, and mostly white tail. Some females look similar to males while others look very different, with dark spotting below and a mostly green tail with white tips."

- eBird

#birds #white necked jacobin #birds of north america #north american birds #hummingbirds #hummingbird #jacobin #jacobins #birds of mexico #birds of central america #birds of america #american birds #bird #birding #birdblr #birblr #bird watching #bird of the day #Florisuga mellivora

[wingedjewels]

Florisuga mellivora - Colibrí acollarado - White-necked Jacobin by Alejandro Bayer T. Via Flickr: Fotografiado desde mi habitación en Circasia, Quindío, Colombia.

#Colibrí collarejo #White-necked Jacobin #Florisuga mellivora #Circasia #Quindío #Colombia #Colibrí #Backyard #Backyard birdwatching #Hummingbird #Birdwatching #Home birdwatching #Garden #Jardín #flickr

[bird-of-the-day]

BOTD: White-Necked Jacobin

^Image credit: Charles J. Sharp

White-Necked Jacobin (Florisuga mellivora)

The White-Necked Jacobin was first described in 1743 by the English naturalist George Edwards in A Natural History Of Uncommon Birds. He used the name 'white-belly'd huming bird'. It is typically seen high in trees, but flies lower at forest edges and clearings.

#white-necked jacobin #white necked jacobin #jacobin #hummingbirds #hummingbird #florisuga mellivora #birds of mexico #birds of central america #birds of brazil #birds of peru #birds of bolivia #tropical birds #bird taxonomy #birding #bird facts #bird fact #bird #birds #bird of the day #ornithology

[birdblues]

White-necked Jacobin

#white necked jacobin #hummingbird #Florisuga mellivora #bird #upl

[birdirectory]

white-necked jacobin (Florisuga mellivora) by Ciro Albano

#florisuga mellivora #beija-flor-azul-de-rabo-branco #white-necked jacobin #animal #bird #pollen #upload

[cilginfizikcilervbi]

Erkek Kılığındaki Dişiler

Erkek Kılığındaki Dişiler Bilim insanları dişi beyaz boyunlu Jakoben sinekkuşlarının (Florisuga mellivora) bir kısmının erkek gibi göründüğünü fark ettiler. Dişiler, erkekler gibi mavi kafalara ve parlak beyaz kuyruklara sahipti. Oysa normal dişi sinekkuşları donuk yeşil renkli ve daha küçüktür. Dişilerim beşte birinin erkek gibi görünmesinin altında yatan evrimsel süreci araştıran bilim…

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#Erkek Kılığındaki Dişiler #Florisuga #Florisuga mellivora #Jakoben #Jakoben sinekkuşlarının #mellivora #sinekkuşlarının

[audible-smiles]

sex-limited polymorphism is most well known in males (think Calidris pugna or Uta stansburiana), but it also occurs in females. something like a quarter of all hummingbird species on earth have independently evolved an androchrome morph, which means that some females have the plumage and coloration associated with males. there are a lot of competing hypotheses as to why this happens. but last year a study on white-necked jacobins (Florisuga mellivora) a species where 20 to 30% of the females are androchromic, revealed that they faced less social harassment and were able to spend longer at feeders than females with typical plumage. the theory is that males of this species have such a reputation for aggression that if you look like one, the other males in the area will take more time sizing you up before trying to chase you away from a food source, and are more likely to go after individuals they perceive as easier targets (females) first. in the meantime, you get to eat more. a lot more work needs to be done to understand things like whether the androchromic females are themselves more aggressive, why only some females adopt this strategy, what genes are at play here, whether there is male sexual preference for one female morph over the other, etc. but it is SO COOL, and a good reminder that you may not be able to sex a sexually dimorphic species in the field as accurately as you think you can.

#birblogging #top posts

[argents-world]

Jacobino cuello blanco o jacobino collar grande,(Florisuga mellivora)

[cloudtales]

Sex and power in the animal kingdom: seven animals that will make you reconsider what you think you know

Sex and power in the animal kingdom: seven animals that will make you reconsider what you think you know

The white-necked jacobin (Florisuga mellivora) is a medium-size hummingbird Milan Zygmunt/Shutterstock It’s easy to assume all animals have a neat dividing line between the sexes because the differences in appearance between males and females can be so striking. But the more scientists learn about wildlife, the clearer it is that nature doesn’t have a rule book. Most people know that male…

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[terranlifeform]

#white-necked jacobin #Florisuga mellivora #Asa Wright Nature Center - Trinidad and Tobago

[sciencespies]

Male hummingbirds are so annoying, females wear disguises to not be harassed

https://sciencespies.com/nature/male-hummingbirds-are-so-annoying-females-wear-disguises-to-not-be-harassed/

Male hummingbirds are so annoying, females wear disguises to not be harassed

When it comes to birds, sexual dimorphism can be very pronounced indeed.

Males may announce their presence with flashy feathers, while females of the same species are much more sedate – an adaptation thought to be related to sexual selection and reproduction.

While not universal for all birds, such was thought to be the case for the white-necked jacobin (Florisuga mellivora). But scientists have now discovered that a significant number of the females of this hummingbird species are brilliantly colored, just like the males.

This, they found, helps to prevent aggressive behavior the males tend to direct at female hummingbirds during feeding, including pecking and body-slamming to assert dominance over food.

“One of the ‘aha moments’ of this study was when I realized that all of the juvenile females had showy colors,” said ornithologist Jay Falk, now of the University of Washington, and formerly of the Cornell Lab of Ornithology and Smithsonian Tropical Research Institute.

“For birds that’s really unusual because you usually find that when the males and females are different, the juveniles usually look like the adult females, not the adult males, and that’s true almost across the board for birds.

“It was unusual to find one where the juveniles looked like the males. So it was clear something was at play.”

(William Stephens, iNaturalist, CC-BY & Erland Refling Nielsen, iNaturalist, CC BY NC)

The difference between male and female plumage in the white-necked jacobin is striking. Males (left, in the image above) have shimmering blue heads, green backs, and white bellies and tails, with a white band on the back of the neck. The females (right) are more subdued green and black, with their white necks and bellies speckled with darker feathers, and darker tails.

Or rather, that’s what we thought. As Falk and his team noted, all the juveniles – male and female – have more colorful plumage.

As they mature, however, only around 80 percent of females change their outfits. The remaining 20 percent kept their flashy duds, making them practically indistinguishable from the males at a glance.

The reason for this wasn’t exactly clear, so the researchers designed an experiment to observe how the birds interact based on their coloring. They set up a hummingbird feeder, and added different taxidermy mounts to observe how that may alter the interactions of visiting wild birds.

There were three combinations of two mounts: male and heterochromatic (subdued coloring) female; male and androchromatic (colorful plumage akin to male) female; and both heterochromatic and androchromatic female.

Hummingbirds tend to compete aggressively for food resources, even among their own species, so the researchers recorded both sexual and aggressive interactions amongst the birds.

They were trying to determine if the androchromatic females were preferred as mates, which would suggest that their bright coloring had a sexual selection benefit.

Interestingly, the males still preferred the more plainly-colored females sexually. In 100 percent of the trials, the first sexual advance was made towards a heterochromatic female – ruling out mate selection as a reason for the bright coloring.

However, the flashy androchromatic females were much less frequently the target of aggression during feeding when paired with a heterochromatic female. When both taxidermy mounts, one male and one female, had the vivid coloring, the wild males showed no bias in where they directed their aggression.

This suggests that disguising themselves as males reduces the rate at which females are socially harassed by males – which, in some cases, seems to be preferable to appealing to them sexually. Raise your hand if you can relate.

“During the 26 trials of the mount experiment, we witnessed 1,790 instances of aggression toward mounts .. and 359 chases involving wild white-necked jacobins,” the researchers wrote in their paper.

“Aggression was therefore frequent, and androchrome plumage effectively reduced these encounters.”

Interestingly, this could explain the unusual coloring of the juveniles. As Falk noted, most species of birds with sexually dimorphic plumage tend to have the more camouflaged adult female coloring, which can help protect vulnerable fledglings from predators. Bright coloring in juveniles suggests that, at least in white-necked jacobins, they need greater protection from their own kin.

The team hopes, in future research, to use their findings to learn how and why other species might have evolved sexually dimorphic traits.

“Hummingbirds are such beloved animals by many people, but there are still mysteries that we haven’t noticed or studied,” Falk said.

“It’s cool that you don’t have to go to an obscure unknown bird to find interesting and revealing results. You can just look at a bird that everyone loves to watch in the first place.”

The research has been published in Current Biology.

#Nature

#Nature

[wingedjewels]

Florisuga mellivora - Colibri collarejo by Alejandro Bayer T. Via Flickr: Belleza fotografiada desde mi habitación en la casa de Circasia, Quindío, Colombia.

#Colombia #Backyard #Backyard birdwatching #Home birdwatching #Observación de aves #Jardín #Armenia #Circasia #Colibri collarejo #Florisuga mellivora #flickr

[factoidfactory]

Random Fact #3,300

The scientific name of the white-necked Jacobin (a kind of hummingbird) is Florisuga mellivora.

Its scientific name roughly translates as “devourer of honey by sucking” (as in the action, not the insult, lol).

Flori - From flos/floris, Latin for “flower”.

Suga - From sugit, Latin for “to suck”; possibly via the Portuguese verb sugar* (to suck/suction), as suga is the conjugated form of the verb for she/he/it and the bird in question can be found in Brazil.

Melli - Latin for “honey”.

Vora - Conjugated form of the Latin verb vorare (to devour)

* the “su” letter combination in the Portuguese verb sugar is pronounced “soo”, there is no H sound like in the English noun “sugar”. 

And the A is an open A (like the A in “ah”).

#random facts #did you know #random factoids #bird facts #hummingbird #brazil #brazilian fauna

[omglssoctworld]

White-neked Jacobin by MarioArana

#IFTTT #500px #Flora y Fauna #Florisuga mellivora #Bird #Nature #Canon #7D #Photography #Wildlife #Heredia #Co

[vergaracarbonepublicidad-panama]

Jacobino de Cuello Blanco - Florisuga mellivora - (en Juancarlos Vergara Carbone publicidad) https://www.instagram.com/p/CYm5N8wJKal/?utm_medium=tumblr

[cloudtales]

Sex and power in the animal kingdom: seven animals that will make you reconsider what you think you know

Sex and power in the animal kingdom: seven animals that will make you reconsider what you think you know

The white-necked jacobin (Florisuga mellivora) is a medium-size hummingbird Milan Zygmunt/Shutterstock It’s easy to assume all animals have a neat dividing line between the sexes because the differences in appearance between males and females can be so striking. But the more scientists learn about wildlife, the clearer it is that nature doesn’t have a rule book. Most people know that male…

View On WordPress