Which animal do you think will overthrow humans? I think it's the furry, sociopathic dictators known to humanity as cats! =)
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Cats. They almost already HAVE taken over the world.
My Girlfriend is CONVINCED that butterflies and moths will take over the earth. She's absolutely terrified of them. I don't mind why, she just is.
Cats I could imagine, probably not dogs....too many good boys and girls there.
Realistically it would probably be ants or cockroaches. The excellent movie "Phase IV" gave us a glimpse of that back in 1974.
Crows. People underestimate how smart they are. They can use tools, they have a language and culture, and they can fly. Plus, they can make friends with other animals, and mimic noises.
Cows. We must prepare for the cowpocalypse or we will all be manburger.
they have already started planning. they have taken over nintendo as we speak 300px-Mead...593d48.jpg 
Ants, they’re very intelligent and are very strong and are effective workers. Once humans are gone it’ll be the ants who manage the world
Ants were here long before we were. They invented farming and livestock long before we did. They are a vital part of each ecosystem they are involved in. If humans disappeared, the Earth would be fine, might even be better off, except for domesticated animals. If ants disappeared, we would have a serious problem. There are a million ants for each human on earth, at least. They could absolutely do it if they wanted to.
all of them. they will team up and take over. and we are powerless to stop it
If not cats, probably ants. There’s a bunch of them, humans don’t really care about them and they don’t need us to survive.
Any type of insect. Most insects are able to reproduce fast and in large amounts, and they have all sorts of adaptations. I'm not very fond of them, but c'mon, how many insects can we actually catch? So def small critters..
Cockroaches. They live through anything, and have lived through everything. They will never go away. NEVER.
