Globe and Mail columnist Allan Maki wrote an exposé that reveals Gainer may be a Richardson's ground squirrel, or some other species.
"The irony here is that while the Stampeders are worried about a six-foot, short-tailed Gainer invading their stadium and making Saskatchewan fans cheer louder, they don't know if he's really a gopher, and neither does anyone else. It could be a ground squirrel, a hamster in disguise, or worse, an elected member of Saskatchewan's legislative assembly."
Gainergate Goes Goofy. Gosh. Go Gainer, Go Green Riders! - Saskboy
Is Gainer Really a Gopher? - Allan Maki
Watch the Game with Gainer - Rod Pedersen
Au Revoir, Gopher - Sports Illustrated