Mmm, depends on the contrast. Bats and Raven's fly but feathers and bat wings.
Spider and Raven- small and big.
Snake and Raven- some snakes eat birds....and I think it's more of a known cliche sort of image.
O snap. That's right, I did some totem animal ideas for her, huh? Ooooo----uhm. Either work? *no help at all* And I don't know much about the species to nail a specific one.
Bat would be pretty damn cute too though.