A studio for bird study

Tag: bird

Raptors of North America – Northern Goshawk (Accipiter gentilis) Illustration

by Bryce W. Robinson

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I’m working to illustrate the raptors of North America. To help me out along the way, you can purchase limited editions prints of plates, like this image of the Northern Goshawk (Accipiter gentilis), in the shop.

A special thanks to HawkWatch International and Golden Eagle Audubon Society for their support of my work.

Bearded Vulture Illustration for HawkWatch International Shirt Design – Support Worldwide Vulture Conservation

by Bryce W. Robinson

Bearded Vulture

I was given the opportunity to provide a t-shirt design for HawkWatch International featuring the Bearded Vulture. The design and shirt are meant to both raise awareness and support for the important conservation science work of HWI focused on Old World vultures. Old World vultures are facing a myriad of threats that are impacting populations, to the point that most face extinction. Please, learn more about the work of HawkWatch International and consider helping in any way you can. Visit their website to read about the vulture work, and more.  

Click on the photo below to purchase a shirt, and support vulture conservation.

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American Ornithological Society Conference 2019 Logo

by Bryce W. Robinson

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I am privileged to share the logo that I created for the American Ornithological Society’s 2019 conference. The logo features three Bar-tailed Godwit (Limosa lapponica baueri), a flagship bird for Alaska and a focal species for some of Alaska’s most influential ornithologists.

I worked closely with the conference planning chair, Colleen Handel of the USGS Alaska Science Center. We created a logo that ties in closely with the theme of the meeting – Birds on the Edge: Dynamic Boundaries. Colleen is part of a team of researchers headed by her husband, Robert E. Gill (also of USGS), that are responsible for discovering the incredible, sometimes 9 day non-stop flight of Alaska’s Bar-tailed Godwits as they return to Alaska from their wintering grounds in southeast Australia and New Zealand (see Gill et al. 2008). As such, one can see why the species is a great choice to celebrate the AOS meeting being held in Anchorage.

To register for the meeting or learn more, visit the AOS 2019 Conference website. Also, be sure to check out the merchandise that features this logo.

Differentiating Adult and Juvenile Gyrfalcon (Falco rusticolus)

by Bryce W. Robinson

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Given that much of my career has been focused on the world’s largest falcon, the Gyrfalcon, I often get questions about their life history and Identification. A recurring question is the age of individuals that are observed in winter. Most often, folks ask about juvenile vs. adult, so I decided to make available a simple illustration with annotations as a reference for those with these questions.

What I’ve realized is that fleshy parts confuse a lot of people, since an adult should have yellow legs and cere, whereas a juvenile should have blue. However, it takes female birds much longer to change (well into their second year), and the coloration is also influenced by individual quality and hormones. Some adults, particularly females, tend to be quite dull in the winter (compare this with observations of gull legs in winter, e.g. California Gull). Adults that are likely three years or older (given presence of retained feathers in the upper wing, etc.) can have surprisingly dull legs that may appear blue under certain conditions. The key then is to take a step back and focus on the plumage, since in most cases it is quite straight forward.

The illustration above aims to highlight the key points for aging a Gyrfalcon between adult and juvenile. Eventually I’d like to visually describe more micro-aging factors, but for now I think this will be a helpful resource for those more unfamiliar with this species.

Please, feel free to send me feedback and suggestions. Constructive criticism is always welcome.