People have been seeing a lot of these things washing up on beaches lately. But what exactly are they?
They look like something an alien being might leave behind.
They’re actually the egg sacks of horn sharks, discarded after birth.
They’re actually the egg cases of the horn shark. The spiral flanges catch on rocks or in crevices, keeping the egg relatively stationary and safe.
Shark eggs take about 7 to 10 months to hatch.
Here’s what it looks like when they finally hatch!
Take a look on how they look alike as adults