Why are the words "bull" and "bear" used to describe the financial markets?

Why are the words \

There are many theories about how "bull" and "bear" became market terms, but the most common explanation comes from the nature of the animals. The bull tosses things up with his horns, while the bear tears fruit and honey down from trees with his claws. The bull, therefore, represents an upward moving market, and the bear represents a downward moving market.