This document discusses the issue of adaptation to captivity in animals. It notes that animals kept in captivity for purposes like scientific research, conservation, agriculture, and pets can experience changes due to the captive environment that differs from natural habitats. This includes relaxed natural selection, the rise of traits maladaptive for survival in the wild, and loss of genetic diversity over generations in captivity. The document examines implications for conservation efforts involving reintroduction of endangered species bred in captivity, as well as for practices like biological pest control that rely on breeding populations of control organisms. It provides several examples of studies demonstrating morphological, behavioral, and genetic changes observed between wild and captive populations of different animal species.