Animal behavior is the scientific
study of everything animals do,
whether the animals are
single-celled organisms,
invertebrates, fish, amphibians,
reptiles, birds, or mammals. It
involves
• investigating the relationship of
animals to their physical
environment as well as to other
• organisms, and includes such
topics as how animals find and
defend resources, avoid
predators,
• choose mates and reproduce,
and care for their young.