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How animals live A-Z

Adrenaline   A chemical released into the bloodstream when an animal senses danger. It makes the heart beat faster, sending more blood around the body, so the muscles can work harder.

Alpha animal   An individual that leads and influences the rest of its group. The alpha has the best food and the first pick of mates. He or she is often the largest, strongest or oldest member of the group. In some species, such as baboons, the alphas all descend from one “royal” family.

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