|Caltech mascot is a beaver|
|MIT mascot is a beaver. Officially,|
"Tim the Beaver"
|Muskrats (about three pounds) are rarely far from water. (Internet download)|
|Muskrat swimming. When startled, they can|
dive, and stay under water several minutes.
|A muskrat "push-up", in this instance using stems from marsh plants,|
provides some shelter from weather and predators, but is not nearly
as large or as sturdy as a beaver family's branches and mud abode.