|First cycle Ross's Gull (left) with similar aged Black-legged Kittiwake.|
These two are almost exactly the same exact size and this is how the field guides describe them, each about 12.5 inches in length.
|Ross's (left). Sabine's (right).|
The Ivory is clearly a juvenile. Interestingly, all of the Ivory specimens (even the adults) had this strong "creamy-yellow" tinge to them. It may be unique to this species post-mortem as I did not notice it with any other white feathers on the other gulls. And yes, Ivory Gull is larger than BLKI.
|Black-legged Kittiwake (left) with Ivory Gull.|
Now for a group photo of some of the most sought after arctic gulls on the planet:
|From left to right: Ross's, Black-legged Kittiwake, Ivory and Sabine's Gull.|
All of the specimens were collected in Alaska and off its shores. The Ross's was collected in Barrow in September. Here's a first alternate Ross's Gull collected in Barrow in June:
|1st alternate Ross's Gull.|
A special thanks to Dawn Roberts for again allowing access to the collection and putting up with my childness while reveling over these skins.