Bird Strike Committee Proceedings


Date of this Version


Document Type



Presented at 2011 Bird Strike North America Conference, September 12-15, 2011, Niagara Falls, Ontario, Canada.


Copyright 2011 Fortin.



  • The problem;
  • The Biology of Castor canadensis;
  • Capture procedures;
  • The benefits of sterilisation;
  • The Montreal Airport Project;
  • The Farnham Garrison Project;

One beaver too many

Why is the population growing

  • The price of beaver pelts has dropped;
  • The lack of natural predators in urban and semi-urban areas;
  • A species that re-produces rapidly.


  • Chews trees, up to 100m from the pond;
  • Blocks up culvers with dams;
  • Floods roads, rail tracks and farm land;
  • Creates a welcome habitat for water fowl and increases the risk of bird strikes
  • Airports and beavers do not mix!

Castor canadensis (General Information)

  • Location: Almost all of Canada and the USA.
  • Weight: adults from 11-35 kg.
  • Life span: Approx 20 years in captivity and 10 years in the wild
  • castoreum, a rarity, is an oil secreted by a gland, located near the rectum, used to mark its territory
  • Food reserves are collected towards the end of summer to carry the colony through the winter.