Do Not Disturb: The Mysteries of Animal Hibernation and Sleep

Gr 3-6-- An easily read, thorough, and up-to-date exploration of hibernation; estivation (summertime hibernation); and sleep in mammals, birds, and fish. Utilizing the latest research on animal survival in both hot and cold climates, Facklam explains new information clearly and with style. Unfamiliar words are always defined. The process of hibernation as well as its possible value in future space flights are discussed. The three types of hibernation--deep sleep, light sleep, and daily dormancy--are carefully explained with examples. The pencil illustrations on nearly every page are not captioned, and although highly attractive they serve little use in explaining the text. A good index and a fine table of contents help with student research, but there are no chapter subheadings. This is an excellent choice for curricular use and as leisure reading. --Eva Elisabeth Von Ancken, Trinity Pawling School, N.Y.

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