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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 »

www.reference.com Science Biology Zoology

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 »

www.reference.com Science Biology Zoology

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 »

www.reference.com Science Biology Zoology

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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According to Bill Gates, the mosquito is the most dangerous animal in the world due to its prolific disease-spreading capabilities. Mosquitoes are found everywhere aside from Antarctica and are frequent vectors of malari... More »

www.reference.com Science Biology Zoology