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Why some animals have evolved to be faster, while others have more endurance I don't know.

---- Genetically, this is determined by a difference in muscle fiber composition.

Basically there are two types of muscle fiber:

Type I (or slow-twitch) allow for low levels of exertion in which the muscles are used at well below their maximal contraction strength for long periods of time.

Type II (or fast-twitch) allow for short bursts of higher intensity contractions at a much greater percentage of their maximum contraction strength.

So animals with a greater percentage of type I will have more endurance, while animals with a greater percentage of type II will be faster.

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