60+ Pound Beaver taken in a 12x15x36 Comstock Swim Through Double Powered Door Cage. As you will notice, the beaver is almost as large as the cage. This trap recently took a 50 pounder. Fifty pound beaver measure about 32 inches from the tip of the nose to the base of the tail. The body length of the 60 appears to be a bit longer than the 50 pound beaver, 33 1/2 inches from nose to base of his tail. I’m always amazed at the effectiveness of these cage traps since the overall length of the beaver is about 44 inches, 8 inches longer than the trap!