That shelter was especially interesting because it's near the nesting grounds of marine birds that are relatively rare in France or even Europe overall. Cargo ships in the English channel illegally dump oil waste all the time, and the oiled marine birds just float helplessly to the beach, still alive. People pick them up and bring them to the shelter where we literally hand-wash them with soap and put them in a bird drying station. The numbers could get overwhelming and we would have to make "bird washing assembly lines" on occasion.
It's a whole discipline with specialized equipment, passed-down knowledge and passionate people!
An elderly lady come out to see what the fuss was about, saw the bird, went back inside and then reappeared holding a block of polystyrene foam. She marched up to the bird, which very soon after found itself with a lump of foam on the end of its beak. That gave others the opportunity to wrap it in a blanket (bit big for a towel) and take it to the vet.
Those old ladies are tough!
https://en.wikipedia.org/wiki/Silverpoint
Here's a zoomable example by da Vinci (don't you agree they look awfully similar to pencil lines?)
https://www.britishmuseum.org/collection/object/P_1860-0616-...
(What was amusing was that I kept finding it powered off, and spent quite a while trying to find why it could be shutting down. It turned out that, because I kept it on the floor under my desk, the Roomba would occasionally bump into it and hit the power button on the front)