My rabbits loved these and would chew them to nothing. The only problem is when they get wet the coloring makes a mess.

Pros: rabbits like them

Cons: messy

Good for the teeth on the small animals. The mice and gerbils love them.

Pros: Good for teeth

Cons: none

These are great for hampters, rats, mice and more. We use them at the pet store (that I work for) daily. They keep the little guys busy and is great for their teeth.

Pros: keeps them busy and their teeth healthy

Cons: n/a

I used these for my bird. I drilled a hole and hung it with a bell & chain.

Pros: easy to find

Cons: no

Rats love to chew but did not have any interest in these.

Pros: none for us

Cons: Rats did not like them.