Black Tern and Common Tern, Thrybergh Country Park, 30/04/17

Very nice indeed; I have yet to see any of the marsh terns! I did, however, see both Common and Arctic today.

This was my first UK marsh tern, though we saw White-winged in Ethiopia.

Were you sufficiently excited to want to change your username to Chlidonias? I don't think anyone would object to you using that name.

I also saw marsh terns today, though they're not particularly unusual in Poland.