Science Photo of the Day #840

Science photo 840

What is unusual about this creature's heart?

See the answer.

Anonymous wrote on Thu, 03/07/2013 - 16:01:

It doesn't have a heart?

Anonymous wrote on Mon, 03/04/2013 - 17:41:

its a worm

joy11joy wrote on Mon, 03/04/2013 - 13:49:

Its heart is a tube running the length of its body.

bphodnefield wrote on Mon, 03/04/2013 - 13:42:

Maybe that its heart can slow down from beating to really slow beats or it can like stop beating and still be living.