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According to the University of Washington, the green lizard has the smallest brain. Referred to as Anolis Carolinensis, green anole or Carolina anole, the species has been studied by the scientific community. More »

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The smallest animal on earth is the tardigrade. The tardigrade is also known as the moss piglet or water bear. More »

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Leaving aside invertebrates, which are often microscopic, the smallest land vertebrate is Paedophryne amauensis. This tiny frog was discovered in the jungles of New Guinea, and adults are only 0.27 inch long. More »

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The animal with the largest brain is the sperm whale. Its brain weighs approximately 17 pounds and can grow to be nearly 500 cubic inches. More »

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An earthworm's ventral nerve cord carries signals from the brain to the body and allows for the coordination of the ganglia in each segment past the fourth. Ganglia are clusters of nerve cells, and an earthworm's brain i... More »

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Using the Beagle as an example breed, the domestic dog has a brain with an average weight of 2.54 ounces, or 72 grams. Of course, this brain size differs by breed. Dogs usually have a brain-to-body mass ratio of 1:125. More »

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Forests, grasslands and desert environments are all examples of terrestrial animal habitats. Aquatic and marine habitats include lakes, ponds and oceans. Animal habitats are also defined by physical factors including soi... More »

www.reference.com Science Biology Zoology