As far as I know, there were only two creatures (four, in a way) that have appeared in previous games. Fuzzles have been live ammo, and Doc is a Vykker doctor that has promised to do surgery on Stranger. However, you might count the bees and the Boombats, if you think AO's bats and bees would count as a reoccurance in the games.
Color birds, I'm not confident. I've never played the game.
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