r/interestingasfuck • u/DearEmphasis4488 • 1d ago

Animals sleep time

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u/Maultaschtyrann 1d ago

It's WAY more than thousands. Considering they are BY FAR the oldest type of animal, they evolved in different directions for billions of years

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u/Educational-Data1270 1d ago

Oldest vertebrate*. And they’ve been evolving since the Cambrian period, so earliest they appeared would be 540 mya

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u/hilarymeggin 1d ago

This guy fishes!

5

u/Enlowski 1d ago

*googles