ANSWERS: 5
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Dogs
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I would guess some sort of fish
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I don't actually know, but maybe cows.
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probably a pigeon
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According to http://www.wisegeek.com/what-is-the-most-numerous-animal.htm , the most ubiquitous and numerous animal is the nematode. "They cover practically every square inch of the land and sea. Nematodes account for 90% of all life on the ocean floor. In certain fertile areas of topsoil, there are over a trillion nematodes per square mile. Most biologists agree that nematodes are both the most ubiquitous and most numerous animal on Earth. ...there are *10^21 - *10^22 nematodes on Earth, making them the most numerous animal." *1-10 sextillion.
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