Animal Behavior: Instinct Examples of Hormones in Action Hormones are involved in a large array of animal behavior, from sexual tactics to "tamability." Below are a number of examples. Sexual Tactics Among Midshipmen Fish Midshipmen fish actually have two morphologically and behaviorally distinct types of males. Type I males are large, build and occupy nests, and make a droning sound that attracts females to come and lay eggs. The type I male then fertilizes and cares for the eggs. Type II males are smaller and resemble the females. They cannot sing and are too small to defend a territory. Instead, type II males have enormous testes (approximately 20 % of their body size). These "sneaker" males swim into an occupied territory, attempt to fertilize the eggs with a "sperm bomb," and are aggressively chased away by type I males. These fish actually have three types of sex hormones rather than the normal two, a fact that is responsible for the distinct types of males. Tamability of Foxes
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