The elephant brain weighs about 6,000g.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Lobsters have blue blood.
476
Sheep, goats, octopuses, and toads have rectangular pupils.
7
The seahorse is the only fish to have a neck.
12
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23