Jump to content
Whatbird Community

Help with gulls


Recommended Posts

None of the first three Herring Gulls are juveniles, as they're in post-juvenile plumages, so are immatures. After October, any first-cycle Herrings in the East can be assumed to be transitioning out of juvenile plumage until proven otherwise; it's a bit different in the West. The first and third are in what is thought to be first alternate, while the second is in second basic and is a year older than the others. The fourth bird is an adult Herring Gull (note the wide and distinct tertial crescent; https://cobirds.org/CFO/ColoradoBirds/InTheScope/87.pdf).

https://cobirds.org/CFO/ColoradoBirds/InTheScope/87.pdf

  • Like 1
  • Thanks 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...