@Peter7100 Lol. FOOD, of course!
That was at the sanctuary/museum I visited, where I took those old car photos. The hundred or so acres of sanctuary surrounding the museum buildings contain dozens of species, all of whom have to be fed. There are two large silos to hold grain for the herbivores, and there is a constant cloud of various birds swirling around it day and night, as well as in the trees nearby. That shot of the pigeons on the electrical wire is actually a very, very small portion of the line of birds extending a good half mile in either direction:
Feeding time for the carnivores attracted its share of avian opportunists also, notably black vultures. They roosted in trees in and around the grounds, swooping in for scraps when the various large land beasts had had their fill. (The sanctuary gets regular delivery of road kill from around the region, most commonly deer which is chopped up and hurled over the fences.)
Unfortunately - although I suppose understandably - the large predator enclosures are bordered by very thick double fencing. Much thicker, and spaced farther apart, than the fencing I encountered at the wolf sanctuary I took pictures of previously. So I hadn't meant to post any of those pictures, as from a photography standpoint they are problematic with noticeable fence lines across them. I include them here purely for your edification
