Eagles, owls, hawks, falcons, kites
It is rather uncommon but yes, the Goliath Birdeater tarantula has been seen eating small birds.
Alligators
The zebra can help the bird by letting rest on it back and zebras have insects on their back so that what the birds can eat.
No. You are eating an egg. The egg only has the potential of becoming a bird if it is fertilized and incubated. You are not eating a bird.
Meets and Eat Ostriches at Carowinds Theme Park, South Carolina
Breeding Better Poultry
How to make Jamaican Shrimp and Rice
Cooking Turkey in an Oil Free Fryer