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By Carl W Hoagstrom

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A basic introduction to ethology, which considers the effects of aging on behavior. Slobodkin, Lawrence B. Growth and Regulation of Animal Populations. New York: Holt, Rinehart and Winston, 1961. A classic text on population analysis; covers the effects of aging on population demographics. ALLOSAURUS Type of animal science: Classification Fields of study: Evolutionary science, paleontology, physiology Allosaurus is the archetypal allosaurid, and was the dominant carnosaur of the Late Jurassic. Allosaurus is best known from the remains of at least sixty specimens collected at the Cleveland-Lloyd dinosaur quarry in Utah.

The Discoglossidae are European and Pelodytidae are Asian in their distribution patterns. The midwife toad (Alytes obstetricians) has an unusual reproductive mode, in that after fertilizing the eggs, the male cements them on his back and carries them to and from the water until they are ready to hatch. The Rhacophoridae are a moderate-sized family (about 180 species), distributed over southern Africa and southeast Asia. Most members have expanded terminal digits, and some even have extensive webbing between their toes, which allows them to glide between arboreal perches.

In animal life, two or more adults and their offspring often form close bonds and tend to exclude those who are not related. Each recognizes the others as being members, and membership is restricted to those who are among the founders or who are born into the smaller group and who conform in recognizable ways to the norms of the group. Hierarchy or rank is recognized, and often there is a division of labor within the group. It has been demonstrated that those species which spend a large amount of time providing for their young tend to have developed higher social orders.

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