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Self quiz Which of the following is true of innate behaviors? Genes have very little influence on the expression of innate behaviors. Innate behaviors tend to vary considerably among members of a population. Innate behaviors are limited to invertebrate animals. Innate behaviors are expressed in most individuals in a population across a wide range of environmental conditions. Innate behaviors occur in invertebrates and some vertebrates but not in mammals. Researchers have found that a region of the canary forebrain shrinks during the nonbreeding season and enlarges when breeding season beings. This enlargement is probably associated with the annual Addition of new syllables to a canary?s song repertoire. Crystallization of subsong into adult songs.