Here are some pictures of the juvenile plumage, Arctic Tern from Chatfield.
http://www.pbase.com/gwalbek/2015_birds He has been sitting on the end of the sandspit, taking off to fill up on gizzard shad and returning to the sandspit. At first glance he could be overlooked as a Common Tern, but aging the bird helps determine it’s ID. The white secondaries with white-tipped, secondary coverts should not appear in any plumage Common Tern. Additionally, Common Tern should show a dark secondary bar in all plumages except Alternate, which this bird clearly is not. Glenn Walbek Castle Rock, CO -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to cobirds+unsubscr...@googlegroups.com. To post to this group, send email to cobirds@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/9F58746063B4468BAA8376955C1D0EF3%40GWdell. For more options, visit https://groups.google.com/d/optout.
