Write the next sentence in the following story.

How to make your guinea pig comfortable in its cage
Consider the size of the cage.
The humane society of the united states has noted that most cages available on the market for guinea pigs are simply too small. In fact, most cages are instead meant to house smaller animals like hamsters and gerbils.
Unlike other animals, guineas pigs need floor space, not vertical space. They need ample room to move around and exercise in order to stay healthy.