Official list of the birds of Ontario, as maintained by the Ontario Field Ornithologists http://ofo.ca/site/page/view/checklist.checklist

Birds - Photo (c) Paul Cools, some rights reserved (CC BY-NC), uploaded by Paul Cools Check list for Birds (Class Aves)
Source: Ontario Field Ornithologists: 2017 Checklist of Ontario Birds. 2017. Print. 17 pages. (Link)
mikeburrell Added by mikeburrell on March 31, 2017