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By Carl W Hoagstrom

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The first comprehensive, critical, and authoritative review of dinosaur taxonomy, phylogeny, biogeography, paleobiology, and stratigraphic distribution of all known dinosaurs. Provides a very detailed overview of dinosaur anatomy. ALTRUISM Type of animal science: Behavior Fields of study: Evolutionary science, genetics, zoology Altruistic behavior involves an individual’s sacrifice of self in order to help others. In some animals, altruism appears to be genetically determined. there not been sacrifice by some on behalf of the many.

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.

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.

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