Add Yahoo as a preferred source to see more of our stories on Google. A rare chemical indicator suggests sponges may have arrived as the first animals on Earth. A sterol core is primarily composed of ...

The lives of some animals are very short, such as mayflies which generally live for just one day. On the other side of the spectrum are animals with extraordinarily long lives. One example of this is ...

It was the first known observation of a shark species living inside a sponge. The paper, "Sharks checking in to the sponge hotel: first internal use of sponges of the genus Agelas and family ...

Sponges are among Earth's most ancient animals, but exactly when they evolved has long puzzled scientists. Genetic information from living sponges, as well as chemical signals from ancient rocks, ...