Beautiful Hoatzin (Stinkbird) Scientific Name: Opisthocomus hoazin Family: Opisthocomidae Size: About 65 cm (25 inches) long, weighing 700-900 grams (1.5-2 lbs). Appearance: - Features a distinctive crest of spiky feathers on its head. - Has red eyes and a striking blue facial patch. - Plumage is mostly brown with reddish-brown on the belly. Unique Characteristics: - Digestive System: Ferments plant matter in a specialized crop, which causes a strong, unpleasant smell. - Chick Adaptations: Juven