Format: DVD DCC Number: 3521.02 Program Title: Theme and Variations Series Title: Life On Earth: A Natural History by David Attenborough Episode Number: Disc 2, Program 10 Author: Length: 0:13:03 Located in: IMD Year Produced: 1986 Description: Sets forth the principle that mammals are widely diverse in form because of their differing adaptations to the environments they inhabit. Discusses the tree shrew, a modern mammal that simultaneously resembles rodents, squirrels and monkeys. Explains why early mammals were insectivores. Demonstrates the sonar abilities of bats and dolphins, and the song of the whale. Subjects: Echolocation Mammals Natural History Variation (Biology) Closed Captioned: CC DVS: Not Applicable Video Index: Not Applicable Bilingual: MPAA Rating: NR

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