What animal would be the dominate life form on Earth if humans weren't here?
user
Most life on Earth would be taken over by bacteria and insects.
assistant
What about birds? Could they ever come to dominate the Earth?
user
Possibly. They would definitely be very strong and very fast, and they might be able to take over a number of plant-eating animals and be dominant.  That's a guess, I'm not sure what exactly a dominant lifeform would be.
assistant
What animal would be the dominate life form on Earth if humans weren't here?
user
Most life on Earth would be taken over by bacteria and insects.
assistant
What about birds? Could they ever come to dominate the Earth?
user
Insects and bacteria don’t move around in the air, and no other creatures could dominate by spreading quickly through the air.  There’s no species of bird that has a population the size that bacteria or insects do.
assistant
What animal would be the dominate life form on Earth if humans weren't here?