How Many Hearts Does an Earthworm Have?

Earthworms lack a proper heart, which by definition has multiple chambers. Rather, they have five pairs of aortic arches that pump blood through their tube-like bodies.

Madagascar Hissing Cockroach (another pet idea)

Earthworms have five hearts. Cool science facts, Facts for kids, Random science facts

All about earthworms: nightcrawler edition

Earthworm

Curious Kids: Do worms have blood? And if so, what colour is it?

The Adventures of Herman

Earthworms

CuriouSTEM - What's it like to be a worm?

Annelid Circulatory System Definition, Structure & Function