County of Los Angeles Parks and Recreation
Natural Areas:

Deane Dana Friendship Community Regional Park & Nature Center

Devil's Punchbowl Natural Area

High Desert Wildlife Sanctuaries

Placerita Canyon Natural Area and Nature Center

San Dimas Nature Center

Vasquez Rocks Natural Area

Whittier Narrows Natural Area and Nature Center


Nature Related Organizations:

California Native Plant Society

Pasadena Audubon Society

Sierra Club - Pasadena Group

Southwestern Herpetologists Society

Angeles National Forest (626) 574-5200