It is believed that the two species shared a common ancestor about 500,000 years ago.

Apparent competition can occur when two species share a predator.

In biological community, no two coexisting species share the same niche.

The two species shared a common genetic heritage, after all, and looked very similar.

These species share some characteristics which may explain why they beach.

The two species share the same habitat, behaviour and even many calls.

They are mostly solitary, although some species form pairs and share a head of coral.

But even here, not all species share food with their offspring to the same degree.

These species share a number of characteristics that are advantageous for genetic studies.

It did, in fact, begin as a joke, one that other species share.