Saturday, Jan. 12

Tune your ears to hear native birds and learn to identify them by listening alone. Trekkers will identify at least eight kinds of birds on this moderate 2-mile hike, stopping often to watch and hear. Binoculars recommended, and sturdy shoes.

9 to 11 a.m., Sugarloaf Ridge State Park, 2605 Adobe Canyon Road, Kenwood, sugarloaf.com, $10.

Saturday, Jan. 19

Meet at the visitor center for a free, guided hike to the Sugarloaf waterfall with instruction and information given in Spanish (caminata en Espanol). Expect misty weather when close to the falls, and dress for mildly strenuous hiking.

10 to 11:30 a.m., Sugarloaf Ridge State Park, 2605 Adobe Canyon Road, Kenwood, 996-0712, sugarloaf.com, $8 parking.