Bald eagles are the main attractions of the seasonal guided hikes through Lake County’s Cache Creek Natural Area, but tule elk, osprey and many other wildlife species may appear during the 4-mile trek. Led by Bureau of Land Management naturalists, the weekly hikes (limited to 25 participants each) include a 600-foot climb in the first mile; wear hiking boots and warm clothing, and bring water, lunch and binoculars. The Feb. 5 and 12 tours are already full, but call for possible cancellations. Self-guided hikes also are an option.
Vitals: 10 a.m. Saturdays through Feb. 26. Cache Creek Natural Area, Highway 20, 8 miles east of Clearlake Oaks. Free; reservations required. (707) 468-4000. www.blm.gov/ca/st/en/fo/ukiah/cachecreek.html.
– Butterfly Beach Party: Pismo Beach salutes another winter migrant with a special celebration for California Western Monarch Day. The visitors bureau will serve cake and punch to the humans visiting the city’s butterfly grove, which has hosted an average of 25,000 monarch butterflies over the last five years and holds twice-daily walks in season. The black-and-orange beauties also cluster in sites from Fremont to San Diego; see the website for details. 1 to 3 p.m. Friday, access from North Beach Campground, Highway 1, Pismo State Beach. (805) 773-7034, www.monarchbutterfly.org.
– Moon musings: Griffith Observatory, a former astronaut training site, marks the 40th anniversary of the Apollo 14 moon landing with a public lecture series this week. Topics include astronauts’ experiences, moon rocks, the earlier flight by Ham the Space Chimpanzee – and the theory that it was all a hoax. The series is capped by the monthly public star-viewing party with knowledgeable amateur astronomers. Lectures, varying times today through Feb. 6; star party, 2 to 9:45 p.m. Feb. 12.