There are many parts of the country that too many beaver (four legged) are destroying the enviorment. Most conservation depts., corps of engineers, and almost every other group realize this problem. Around here they are shot at night with full choke shotguns loaded with 000 or 00 shot under spotlight. Also when this is done after shooting one stop for a few minutes and look around there are more. If there is one beaver there are more, very social animal. I am sure this is against most or all laws, but just at dusk is when they usually come out, and go back in around first light. Find where they den and you can help your situation .