I'm under the impression that predators can see color & prey animals cant. The reasoning explained to me was that a deer for instance doesnt need to identify what it sees as much as a predator, it just needs to see somethings moving & then they can decide to bolt or hang out. They because of their type of vision can see movement very well & can also see real good in low light. A predator needs to know what it sees so as to figure if its something it wants to catch for dinner. Probably it saw you up there & didnt feel threatened or thought you were an orange blob that wasn't fit to eat.