Pinau Merlin of the UA-USGS Jaguar Survey and Monitoring Project presents "Secrets of the Spotted Cats: Jaguars and Ocelots of the Southwest," at 2 p.m., Thursday, Feb. 13. Volunteer naturalist Bob Brandner presents "Reptiles and Amphibians of the Sonoran Desert," at 2 p.m., every Tuesday, through Feb. 25. Programs are included in park admission; $5. Talks are wheelchair accessible. Call for reservations.