Shalder is the Shetland name for the Oyster Catcher. It's Norwegian name is Tjeld. (It's difficult to explain how the Norwegian name is pronounced, but it sounds a bit like "Tchell", which is likely the root of the Shetland name.)
But in any language, it has to be the stupidest bird that ever flapped a wing... Although maybe that's not true, because I haven't got round to a post I meant to do about the Magpie yet.
Anyway, here's Sammy the Shalder, just over a week ago, sitting on a digger bucket, at the building site next door to us.
Yun's aa fir enoo.
KESTREL AT BOTALLACK
1 day ago