This is probably the weirdest biology story I've ever come across. I thought it might be a hoax, but it's a long time after April 1st.

It seems that marine researchers have discovered two species of worms that live entirely on the bones of dead whales. The worms have no mouths, but 'roots' which they insert into the whale bones, containing symbiotic bacteria which can digest the fats from the bones. The worms are distantly related to the tubeworms that live around undersea hydrothermal vents.

Oh yes, and the worms are all female. They contain tiny parasitic males, little more than bags of sperm, to fertilise their eggs.

Ain't nature wonderful?