More mobile species might simply follow the fish to a new home.

If not for the species to follow, for whom?

These enable grass-eating species to follow the rains and thereby their food supply.

The various species followed their own customs because they were built to.

Many species follow the trails of worker ants of specific species.

This may not be the wisest course, I admit, but it is the one my species has long followed.

The many species which feed on them follow them up and down.

All species inevitably follow this law, or as a consequence go extinct.

The species eats insects, and usually follows swarms of army ants to catch prey.

Some species follow army ants, eating from the disturbance created.