Ring-necked pheasants aren't native to Illinois or even the United States, but these birds have been common since the 1800s after being introduced as a game bird.
Ring-Necked Pheasants - prdseed
Hunting the pheasant America's most popular upland bird
Letter to the editor: The decline of the ring-neck pheasant population has many causes – Reading Eagle
Pheasants fit fine in America
Ring-Necked Pheasant: Game Bird Profile - Gun Dog
Ring-Necked Pheasant: Fast Facts, Management Tips and Trivia
Pheasants choose farms over grasslands, surprise researchers
The American Ring-Neck Pheasant
Ring-necked pheasants are wily escape artists
Ring-necked Pheasant Identification, All About Birds, Cornell Lab of Ornithology
Forest Preserve District of Will County
Pheasant History and Facts in the United States
RING-NECK PHEASANT HUNTING 101
Lockport Prairie Nature Preserve
Increasing Pheasant Populations On Your Land - Blog