The tuyango is a large flightless bird of monstrous nature that preys upon humans and other humanoids. Tuyangos live in marshlands where their mottled feathers blend with swamp grasses and tangled briars. They possess an excellent sense of smell and can accurately detect the presence of humanoids within a 1/4-mile radius; however, they have poor eyesight. This forces the creatures to rely on stealth and surprise. Patient ambushers, the monstrous avians are known to track prey for hours or even days and can remain still for long periods in wait for the perfect opportunity to strike. Once a target comes within range, the tuyango leaps from its hiding place with a piercing squawk and uses its long legs to propel itself across the swampy grounds towards its prey at uncanny speed. Once a tuyango tastes humanoid flesh, it becomes crazed and continues attacking until it or its target is slain. If the bird drops its prey, it ignores all other threats and attempts to drag off the kill to gorge on its flesh. For this reason, the grounds surrounding a tuyango nest are notoriously littered with cracked humanoid bones.

Eggs and Hatchlings. Tuyangos live in flocks consisting of two to five adults that infrequently reproduce throughout the year. Females lay eggs in multiple clutches of 8 to 12 and aggressively protect their nests. The eggs are about 8 inches in length with pale yellow shells and pepper-colored speckles. The eggs have an incubation time of around six weeks. Hatchlings emerge featherless and near-blind but every bit as vicious and bloodthirsty as their parents. Born ravenous, as soon as the hatchlings emerge, they clamber from the nest and merge into swarms that scour their surroundings for bones and other scraps of food. Evil humanoids living in proximity to tuyangos have been known to steal their eggs and sell or pawn them off to unsuspecting victims.