Lol didn't want to get into exact details as I didn't want to take away from the topic at hand, but in regards to Birds, its any bird that uses its Talons to kill are not allowed. So yes technically if a pigeon eats a worm, it would still be allowed. Chickens are omnivores without a doubt, they eat worms, bugs... but do not have Talons to kill like an Eagle.
I can go into even more detail but I just was asking about how you guys ate Snakes and Crocs, at what temp or rarity it was done too.