I was not expecting it to be there.Smithsonian National Zoo! Amazon building. And yes, it's a rainbow boa.
That's a really good analogy and I think that the reason that the small enclosure myth for many species is exactly for this reason.The big question, because the snake can't handle big cages or because people are not willing/able to decorate their cages appropriately? Put a gorilla in a hectare large mown grass field and it may also feel nervous due to the lack of shade, put it in a hectare large forest and it would feel fine.