Pest Control Companies are hired to deal with many species. These include pigeons, mice, rats, bugs, feral cats, raccoons, and squirrels. A long list of almost any creature that is considered an annoyance or pest.
The resulting demise of these creatures is in many cases far from pleasant.
Further information can be found at http://www.pmra-arla.gc.ca/english/legis/pcpa-e.html and http://www.bcpestmgnt.com/major/ .