Yes bears!!!! We are against the foothills and black bears frequent our yard from spring to late fall - it used to be a path to/from our neighbor's pool where they would take a dip in the summer, and then go down the drive to knock over our trash can ... until i got a bear-proof trash can and chickens. Suddenly the mama decided fresh chicken was waaaaay tastier than scraps from last night's dinner. Neighbors get them often if they have avocado trees .... even California bears love California avocados! LOL
I haven't seen weasels - yet. Its the raccoons and coyote that I worry could tunnel.