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. 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. ARCHAEOLOGY TOURS. The Center for Desert Archaeology offers tours of both downtown Tucson and remote desert sites, providing new visions of Tucson's fascinating past. See the hidden 3,000 year-old village downtown, prehistoric rock art petroglyphs or half-day tours to Signal Hill, Picture Rocks, King's Canyon and Sabino Canyon. Contact Connie Allen-Bacon at 881-2244 for more information on tours. Individual, group and corporate rates are available. TOHONO CHUL PARK. 7366 N. Paseo del Norte. 742-6455. Tohono Chul Park grounds are open from 7 a.m. to sunset daily. Exhibit hours are 9:30 a.m. to 5 p.m. Monday through Saturday, 11 a.m. to 5 p.m. Sunday. Admission is $2. The park presents "Walk in the Park Tours" at 10 a.m. Tuesday, Thursday and Saturday, and 1 p.m. Sunday. "Birds of Tohono Chul Tours" depart at 8 a.m. Monday, Wednesday, Friday and Saturday. Tours last about one hour. "Art in the Park Tours," a docent-guided look at the gallery exhibits, happen at 11 a.m. Tuesday and Thursday and 2 p.m. Sunday. There are two "WaterSmart" workshops from 9 to 11 a.m. and from 1 to 3 p.m. Saturday, February 3, in the Wilson Room. Call 742-6455 for reservations and information. Arizona-Sonora Desert Museum. 2021 N. Kinney Road. 883-2702. The museum is part botanical garden, part geology museum and part zoological park. Naturalistic settings house 1,386 plant species and 317 animal species. Interpretive tours, live animal visits, and botanical and raptor interpretations are given daily. During the month of January early morning birdwalks begin at 8:30 a.m. Tuesdays and Thursdays. Guided tours are suspended until April. Live animal interpretations are held daily at 8:30, 9:30, 10:30 a.m. and 1:30 p.m. Museum hours are 8:30 a.m. to 5 p.m. Sunday through Saturday. Admission is $8.95 ages 13 and over, and $1.75 ages 6 through 12. Discount group rates are available.

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