R’ Yehudah says: One who traps a bird [by driving it] into a closet, or a deer into a house, is liable. But the Sages say: [One is liable for driving] a bird into a closet, or a deer into a house, a courtyard, or a vivarium. Rabban Shimon ben Gamliel says: Not all vivaria are alike. This is the rule: [If] it requires [further] trapping, one is exempt; [if] it does not require [further] trapping, one is liable.