Some insects and reptiles have a strange self-preservation characteristic — they suddenly start bleeding from places like their eyes or knees.

Scientist Sebastian Hoefer says, “It really does look like it’s deliberate. Deliberately, it’s bleeding to put this show on.”

A show put on to deter any would-be predators. NPR science correspondent Nell Greenfieldboyce looks at “reflex bleeding” and explores some of the creatures that bleed on purpose.

Short Wave Podcast

It’s science for everyone, using a lot of creativity and a little humor. Join host Maddie Sofia for science on a different wavelength.