9. Sexual selection is a major area of study in evolutionary biology. Researchers in this area of study are interested in the interactions of male and female organisms before, during, and after copulation where selection may occur. For example, "why does a male peacock have such a large tail of feathers?" Why might we expect to see selective influences in reproductive interactions? In other words, discuss why there might be adaptive significance to the types of interactions we see between males and females and within males and females (e.g. male-male competition).

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Animal Behavior

Animal behavior can be defined as all the things that animals do. In response to a stimulus, an animal performs a certain fixed action pattern, or FAP, of behavior. This response occurs to make the animal more adaptable to change. So, behavior is generally a stimulus-oriented response. A behavior is an expression of the capabilities of the nervous system. A stimulus is determined by the environment, while the nervous system determines a response.