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v1dlr TIL squirrels' brains grow in size during the fall to help them remember where they bury their nuts. Their brains are smaller the rest of the year
X9Mj TIL A sleeping Killer Whale (Orca) pod (approx. 6-30 whales in a pod) breathes in unison - they form a tight circle, then surface for air and re-submerge as one, while sleeping!