Over the years I've seen a small number of LBBGs which have their tongues protruding from their chins. The theory is that the gulls have caught some sharp food, which when being swallowed pierces a hole in the bird's chin. I guess the bird then sticks its tongue in the hole as it must be an irritation...then the tongue gets stuck through the hole and can't be withdrawn. The birds do appear to survive and continue to breed...but the tongue is then compromised and movement severely restricted.
We recently caught such a gull on Burhou, Alderney. It was relatively easy to ease the tongue back and get it clear of the hole...but of course we do not know if it will poke it through the hole again.
Interestingly, I've never seen a Herring Gull or Great Black-backed Gull with this condition.
LBBG With tongue protruding from chin - then the hole when tongue eased back in to mouth (c) PKV