Basic Rules, pg. 154
Echolocation. The swarm can’t use its blindsight while deafened. Keen Hearing. The swarm has advantage on Wisdom (Perception) checks that rely on hearing. Swarm. The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening large enough for a Tiny bat. The swarm can’t regain hit points or gain temporary hit points.
Bite. Melee Weapon Attack: +4 to hit, reach 0 ft., one creature in the swarm's space. Hit: 5 1d4 piercing damage, or 2 1d4 piercing damage if the swarm has half of its hit points or fewer.
Hill, Mountain, Underdark, Urban