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The Conflict Over Coexisting With Beavers

Beavers (Castor canadensis) have been in North America for two million years. Their ponds ease flooding downstream, and support large numbers of bird species, fish, amphibians, and otters. They are a keystone species to an entire eco-system. Humans and beavers have a long history together because they like to live in the same places, but the way we've built our infrastructure has almost guaranteed our two species will be locked in eternal conflict.


  • Sam Evans-Brown - host of NHPR's Outside/In, which is in it's third season. The "Leave It To Beavers" episode served as inspiration for this discussion.
  • Anton Kaska - owner ofBorealis Traders, a commercial trapping business in New Hampshire.
  • Skip Lisle - wildlife biologist and owner of Beaver Deceiver International; he's invented several methods for foiling beavers and alleviating flooding problems from dams.
  • Patrick Tate -wildlife biologist with N.H. Fish & Game.

Credit Skip Lisle. Beaver Deceivers International.
A culvert blocked by beaver.

A beaver deceiver designed by Skip Lisle of Beaver Deceivers International.

Credit Photo: Logan Shannon of Outside/In
Trapper Jeff Traynor shows a beaver trap. The stick is the food.

Credit Photo courtesy of Mike Callahan,
A pick-up truck swallowed whole by a beaver dam.

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