Example: certain species of fish may change from male to female during their life.
As for eating fish: she does, but only certain species.
It usually has some preference for certain species in a given area.
Why is it acceptable to kill certain species and not others?
Unlike certain other species, they do not have to be separated from their young.
Certain species were found to be characteristic of specific islands.
The connection will have a larger impact on the survival of certain species.
The identification of certain individual species is often very difficult, even for a specialist in that particular family.
Boredom is only another name for a certain species of frustration.
The various creatures were segregated because certain species did not get along together.
