Needletooth

Needletooth dinosaurs were carnivorous dinosaurs who lived and hunted in large groups, known as needletooth swarms.

Description
Needletooth dinosaurs were vibrantly colored and very small&mdash;only about tall and weighing an average of &mdash;but they had proportionally very large and sharp fangs, from which they earned their name.

Behavior
Needletooth dinosaurs were almost always encountered in a swarm, which travelled along the ground like a brightly wave. They emitted high-pitched whistling, chirping, and trilling noises which, combined with their generally inquisitive and brave attitude, could give the impression that they were harmless or even adorable. However, in truth they were deadly and fearless predators who swarmed and devoured their prey like terrestrial piranhas. Even worse, they were known to be both crafty and patient when hunting their prey.

Combat
A swarm would harass prey until it was time to strike, at which point it surrounded the victim and closed in from all directions, smarming all over them and tearing at their flesh. The prey would quickly start bleeding profusely, and become overwhelmed by disgust and nausea as the swarming continued. Humanoid prey struggled to do anything but try to get rid of the biting creatures.

Some subspecies of needletooth dinosaurs were also venomous, and caused their prey's reflexes to atrophy as they swarmed.

Ecology
Needletooth dinosaurs were aggressive predators of land animals. They were notable for always being hungry, and were neither picky about what they ate nor scared of attacking creatures that were new or strange to them. They were territorial, but were also known to chase prey for miles.

Multiple swarms of needletooth dinosaurs could be encountered together. Large groups of up to eight distinct swarms were known as prides.

Habitats
They were found in the warm forests and jungles of Chult and the Black Jungles, where they were naturally adept at camouflaging within the dense underbrush and foliage.

Their swarms could also be encountered on the planet of Eberron, where they were sometimes known to carry diseases like the red ache.