Dodo Swarm (5e Creature)
From D&D Wiki
small swarm of tiny beasts, unaligned
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 dodo bird. The swarm can't regain hit points or gain temporary hit points.
Nimble Escape. The swarm can take the Disengage or Hide action as a bonus action on each of its turns
Scratch. Melee Weapon Attack: +3 to hit, reach 0 ft., one target in the swarms space. Hit: 3 (1d4 + 1) slashing damage.
Peck. Melee Weapon Attack: +4 to hit, reach 0 ft., one target in the swarms space. Hit: 4 (1d6 + 2) piercing damage.
A pack of fierce dodo birds defending their territory.