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Panther. A carnivorous animal measuring about six feet and a half from nose to tail, which is itself about three feet long. It differs from the leopard chiefly by its superior size and deeper color. The manner in which it seizes its prey, lurking near the sides of woods, etc., and darting forward with a sudden spring, resembles that of the tiger. The puma, or cougar, is sometimes called the American panther.