"I suppose the same might be said of other related species as well."

There can be big differences even between closely related species.

The litter size is probably small, as in related species.

In any event, there are some differences between even closely related species.

Some of these names are shared with other closely related species.

The white on the wings is less extensive than in related species.

There is no trace of humans or any related species in the deep past.

Just like related species, it should be kept in shoals.

The name indicates that this is the central of three closely related species.

Related species can be found all over the world.