OUTDOORS BIOLOGICAL DIVERSITY WALKS. Join Southwest Center for Biological Diversity naturalists for walks through Tucson's nearby riparian treasures. Experts answer questions on ecology, birds, plants, herbs and fish. The effects of different land management policies on riparian resources will also be discussed. All walks are free, and meet at 9 a.m. on the first and second Sunday of each month. Call 733-1391 for locations and information. WINTER BACKPACKING. Learn tips on what to expect and what to bring while venturing out on winter backpacking trips at 7 p.m. Wednesday, January 24, at Bob's Bargain Barn, 2230 N. Country Club Road. Information on trips to Zion National Park and the Grand Canyon are also given. Call Bob's at 325-3409 for information. WINGS OVER WILLCOX. Wings Over Willcox, an annual celebration of the Sandhill Crane, happens January 19 through 21. Activities include workshops, field tours and informational exhibits. Field trip participation is limited. Call (520) 384-2272 or (800) 200-2272 for information. HISTORIC WALKS. Walking tours of El Presidio Historic District are offered every Saturday at 10 a.m. beginning at the Sosa-Carrillo-Fremont House Museum, 151 S. Granada Ave. Tours last approximately 2 hours. Cost is $4. Call 622-0956 for registration and information. SABINO CANYON RUIN. Old Pueblo Archaeology Center offers two-hour guided tours of this ancient Hohokam village from 9 a.m. to 2 p.m. Saturday, January 27. Tours leave on the hour. Participants should bring water, dress properly for the weather and wear sturdy shoes. Reserve tickets by January 26 by calling 798-1201. Tickets can be picked up from the center, at 1000 E. Fort Lowell Road. Tour is free, with a suggested $2 donation to help with operating costs.

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