Gulls.

Whenever I watch gulls in the harbor or at the rivers, I feel a pang of gilt that I don't pay more attention and learn about them. Distuinguishing adult birds is ok, as long as they are among the common species. Now I look at younger birds and look out for a different type. It's hard...

Mew Gulls, カモメ at Muromi River

Adult Vega Gulls, セグロカモメ

From left: Vega, Vega, セグロカモメ -  Black-tailed, ウミネコ - Black-headed, ユリカモメ - Mew Gull, カモメ