Rhamphorhnychus (5e Creature)
From D&D Wiki
Tiny beast (pterosaur), unaligned
Peck. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage.
Hailing from the Jurassic Period, the Rhamphorhnychus is a small piscivorous pterosaur that lives in hard-to-access areas like secluded river deltas and island swamps, preferring to avoid humanoids. These ocean pterosaurs are able to fly distances of 40 miles without tiring. The ancient peoples of the tropical regions where these pterosaurs live have paintings on rocks depicting humans taming these creatures and keeping them as pets and stealthy scouts for war. But, when provoked these tiny terrors will flock together to drive away attackers, they also will devour small creatures like mice in a feeding frenzy.