Yeast are a popular species for study because of the rapid cell cycle.

This is a popular species in the aquarium trade.

This characteristic also makes it a popular species for bonsai.

However, the more popular and valuable species are usually sold separately.

Yet it has never been a popular species.

Here is an incomplete list of the most popular species.

It is a popular species among those who raise stick insects.

For popular species of fish, vendors report that little is wasted.

In this group are many hardy species popular with gardeners and plant collectors.

No, we must also direct our attention now and then to less popular species which do not look as cute.