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Animals
Rather the musical aspects of sound produced and received by animals

Music >
Music Theory

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Squids and octopuses have three hearts with two gill hearts to force blood to the gills and a central heart to send it around the rest of the body. Earthworms are segmented in such a way that segments 7-11 have blood vessels which are more muscular than in the other segments, and are thus called the aortic arches because they pump blood through the body. Thus an earthworm is said to have 5 hearts.

Misc >
Common Threads 2

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Roughly 70% of snakes lay eggs, but the other 30% (which also happen to be the ones living in colder climates) give live birth (they actually hatch their eggs within their bodies )

Misc >
Common Threads 2

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Longest snake (26-32ft/8-10m), longest insect (15in./38cm), and longest fish (42ft/13m)

Misc >
Common Threads 2

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