Pigs must be flying. For a decade, the Wynkoop Brewing Company celebrated its anniversary with an official Running of the Pigs, a Hemingway take-off that featured a plethora of pigs hauling their well-fleshed butts -- and here were talking about the media types who handled them, too -- around a block-long course in LoDo. But that was before the animal-rights people got involved, and the Wynkoop folks decided to introduce a kinder, gentler celebration. Prairie Preservation Day, a celebration of Colorados ecology, comes to the Wynkoop, 1634 18th Street, beginning at 11 a.m. on Saturday, October 21. Highlights include presentations by the Birds of Prey Foundation, Native American dancers and storytellers, lectures by Jack Murphy of Urban Wildlife Rescue (profiled by Harrison Fletcher in the April 20 issue of Westword), a Wild by Day, Wilder by Night: concert by the Fulldogs in the upstairs pool hall starting at 7 p.m. and, at all hours, the opportunity to drink original Prairie Pup Pale Ale in an I Saved a Prairie Dog at the Wynkoop Brewing Company glass -- with $1.50 from each sale actually going to saving a prairie dog. But all animals will not be so lucky on Prairie Preservation Day; although the pigs wont have to run, plenty have already landed on the Wynkoops menu -- as pork sandwiches. Call 303-297-2700 for details, or to register any complaints about the treatment of hops in this country.