Tern ringing at Atlit - and more...

Last night I joined Yosef for a night of tern ringing at Atlit saltpans. This is Yosef's third season working on Common and Little Terns breeding in N Israel, and he has some interesting results already. We arrived rather early and had a quick look around before setting the nets up. Quite many shorebirds around - 10 Blackwits, Whimbrel, Spotshank and Greenshank etc. 

Black-tailed Godwit: amazing how they are able to preform such strenuous long-distance migration during heavy wing moult. This must affect their aerodynamics considerabely.

Many of the terns in the colony are ringed. Incredible how we managed to read rings before we had DSLR's. This is a call to all of our friends in eastern and southern Africa - go and look for our rings! They are very easy to spot, and terns are always fun to watch. Yosef has had some recoveries and controls exchanged with N and E Europe, but nothing in Africa yet, where these birds are heading to for the winter.

The catch was not terrific but not too bad, ended up with 38 birds. Conditions were very good - no wind at all, but humidity was awful. 

Common Tern - 3cy+

Little Tern - 3cy+

Among the terns we had few surprises:

White-winged Tern - adult. What a cracker but wouldn't pose for a photo.

Squacco Heron

This is part of the 3000+ roost of terns, mixed with some Slender-billed Gulls:

Salt and pepper

Yesterday I joined Yosef for his ongoing project of colour-ringing terns at Atlit Saltpans. These saltpans hold Israel's largest tern colony, and are an excellent birding site altogether.

We arrived in time to have a quick look at the colony before setting the nets up. We had this interesting tern - it's very dark both above and below, with a narrow white cheek stripe. The bill is long and red. The bird was large and powerful, like a normal Common Tern. It incubated non-stop, so unfortunately we couldn't see the legs at all. I waited for half an hour for the bird to stand up or fly off, but had to give up and let it be; the nets were waiting.

This bird reminds me very much of this amazing bird ringed by Yosef last year. Whether our bird had rings or not I do not know. The plumage colours are superficially similar to White-cheeked Tern, but size, structure and bill are wrong.

There is a very interesting article by Sean Nixon in Birding World 24: 211-215 illustrating the identification of eastern Common Terns. It describes in detail longipensis, and more briefly tibetana. But to my eyes this bird is far too dark for any longipensis (which should show a dark bill) or tibetana. I have no idea what the dodgy form sinunensis looks like, but I assume it should be paler anyway.

However, one thing I learned last night is that the amount of variation in Common Tersn in huge, and it occurs in all aspects: size, plumage tones, bare parts. So whether this bird is an extremely extreme Common Tern, an 'eastern' Common Tern (breeding in Israel?!), or a hybrid Common X White-cheeked Tern we will probably never know. I will certainly try to return and have better views of this fascinating bird. Of course, any comments on this bird are most welcome.

This is the bird incubating:

And here in comparison to a 'normal' Common Tern:

Anyway, as night fell we started catching terns. We were joined by the Hula team, Rony and Michael. Even though the wind was strong all night long, we had a decent catch of 30 Common Terns, 15 Little Terns (including an ancient retrap from the mid-1990's!) and for a late bonus a beautiful adult White-winged Tern.

Common Tern - adult (4cy+)

Rony the magician

Common Tern - 2cy. Note the very worn unmoulted primaries, PC, alula and GC, and dark lesser-coverts bar. Bill is almost completely dark, and crown mixed with brown. Most Common Terns spend their first year and a half somewhere in the southern oceans or offshore Africa, and only few return north in their first summer.

Little Tern - adult

Little Tern - juvenile

White-winged Tern - adult