You don’t have to walk on two legs and have a big brain to be beset by societal ills. In “Lion Societies in East Africa,” University of Minnesota biologist Craig Packer explores “the darker side of lion life.” Packer will focus on leonine violence and territoriality—problems whose proliferation has come to threaten the species. Can chain smoking, drunk driving, and unsafe sex be far behind? In conjunction with the “Audubon Lecture Series.” At 6 p.m. at the Hirshhorn Museum & Sculpture Garden’s Ring Auditorium, 8th & Independence Ave. SW. $13. For reservations call (202) 357-3030. (Nicole Arthur)