Environment
Sea urchins can drill holes in solid rock with just their teeth
If a sea urchin can't find a suitable pit to live in, it makes one – even if it has to spend months gnawing away at hard granite
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If a sea urchin can't find a suitable pit to live in, it makes one – even if it has to spend months gnawing away at hard granite
Pacific white skate lay their eggs onto the sizzling hot rocks of hydrothermal vents in the depths of the sea, possibly because the heat speeds up their development