Simon Walker's picture

Common Tern, with an all red bill

Observed: 15th July 2013 By: Simon WalkerSimon Walker’s reputation in BirdsSimon Walker’s reputation in BirdsSimon Walker’s reputation in BirdsSimon Walker’s reputation in BirdsSimon Walker’s reputation in Birds
Common Tern, Amwell, 2013-07-15 001
Common Tern, Amwell, 2013-07-15 003
Description:

I'm sure there's an explanation for this, but I don't know what it is.

Identifications
Species interactions

No interactions present.

Comments

ahb's picture

All-red billed Common Tern

It does seem to happen towards the end of the breeding season and the bird guides do mention this. I guess like other species, the 'hard parts' colour varies depending on 'hormones', which vary in individuals as well as during the year?

Alan Brampton (Benson)

Simon Walker's picture

You Learn Something Every Day

Thanks for that. I shall squirrel that bit of information away for future use...

Regards

Simon