We had a hamster and a pet mouse. The mouse was on one side of the cage & the hamster on the other. One night the mouse chewed its way through the plastic wall to get on the same side as the hamster. I'm sure the hamster ran through the tunnels as fast as he could...but the mouse just wore him out. I didn't know that mice like hamsters. Always thought they were in the same breed. Not the case. We'll always miss that little fella. :(

Pros: Hamster ran all through the tunnels!

Cons: He couldn't run as fast as the mouse!

My hamsters love to go thru the tunnels, sometimes they'll stop inside a take a nap.

Pros: fun to watch

Cons: none

for those who have critters these are the most fun to watch plus it would be more fun for the critters

Pros: easy to clean, differant sizes

Cons: cost, not economical for shelters

When I had my hampster she used to LOVE the tunnels. It gives them good excersise even if its in a limited space.

Pros: Great excersise

Cons: sometimes they can chew their way out