GULL-BILLED TERNS ON ABACO
The gull-billed tern Gelochelidon nilotica had a name upgrade from Sterna nilotica some years ago, and was awarded the honour of its own genus. Let’s be clear at the outset: there’s no such thing as a tern-billed gull. Which slightly lessens the scope for species confusion.
For those (me) who need a reminder about the whole family / genus / species taxonomic maze, here is a reminder. The example used is man. Or stickman, anyway.
There are 12 species of tern recorded for Abaco. Only one, the royal tern, is a permanent resident. There is one winter resident, the Forster’s tern and there a 6 summer resident terns of varying degrees of commonness. The other four are transient or vagrant, and probably not worth making a special trip to Abaco to find. The GBT is designated SB3, a summer breeding resident that is generally uncommon, though might be more common in particular areas.
TERN TABLE****I know! Too tempting…
The bird gets its name from it short, thick gull-like bill. It’s quite large in tern terms, with a wingspan that may reach 3 foot. They lose their smart black caps in winter.
There are 6 species of GBT worldwide, and it is found in every continent. While many terns plunge-dive for fish, the GBT mostly feeds on insects in flight, and will also go after birds eggs and chicks. Small mammals and amphibians are also on the menu. The header image shows a GBT with a small crab. I imagine they must eat fish. Surely they do? But I have looked at dozens of images online to find one noshing on a fish, with no success. Does anyone have a ‘caught-in-the-act’ photo?
All photos were taken by Alex Hughes, a contributor to “THE BIRDS OF ABACO”, when he spent some time on Abaco a while back in connection with the conservation of the Abaco Parrot and the preservation of the habitat integrity of their nesting area in the Abaco National Park
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Interesting post, RH, espec. learning that this tern does not plunge dive for fish (I thought they all did). Alex’s photos are superb.
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