Hoatzin has a digestive system unique among birds, using bacterial fermentation to break down the plant materials they consume. The Hoatzin is a unique and unusual species of a tropical bird. The hoatzin is an herbivore, eating leaves and fruit, and has an unusual digestive system with an enlarged crop used for fermentation of vegetable matter, in a manner broadly analogous to the digestive system of mammalian ruminants. The only known case of an avian digestive system with active foregut fermentation is reported for the hoatzin (Opisthocomus hoazin), one of the world's few obligate folivorous (leaf-eating) birds. The digestive system of the Hoatzin Reptile Bird is similar to the one present in ruminant mammals such as cows and goats. The young possess two large claws on each wing, a trait that has led some scientists to link the species with the fossil Archaeopteryx of the dinosaur era. The Hoatzin is herbivorous, eating leaves and fruit, and has an unusual digestive system with an enlarged crop used for fermentation of vegetable matter, in a manner broadly analogous to the digestive system of mammalian ruminants. The hoatzin’s unusual herbivorous digestive system has led to it also being known as the “stink bird”. The Hoatzin is strictly vegetarian, eating the leaves, flowers and fruits of more than 50 species of marshland plants. The Hoatzin has a unique digestive system more similar to cattle than to birds. Bacteria in the bird’s crop breaks down leaves, fruits, and flowers through fermentation. 1. Hoatzin, (Opisthocomus hoazin), primitive chicken-sized bird of South American swamps, principally in the Amazon and Orinoco river basins. Schematic representation of anterior gut of adult Hoatzin seen from left, showing (A) crop, (B) posterior esophagus, (C) proventriculus, and (D) gizzard. This microbial fermentation converts plant cellulose included in consumed foliage into simple sugars. The hoatzin is an herbivore, eating leaves and fruit, and has an unusual digestive system with an enlarged crop used for fermentation of vegetable matter, in a manner broadly analogous to the digestive system of mammalian ruminants. Hoatzins live in groups of 15-100 birds. Hoatzins are very strange among birds, though, because they ferment this vegetable matter in their foregut like cows, sheep, deer and kangaroos, and thus have a specialized digestive system.

The Hoatzin also called Chenchena (in the Colombian Llanos), pava serere (in Bolivia), shansho (in Peru), guacharaca de agua (in Venezuela), or pava hedionda (in Colombia), it is a species of opistocomiform bird, the only representative of the genus Opisthocomus and of the family Opisthocomidae. The word Opisthocomus comes from the Greek opisthe, behind and komes, … Sep 24, 2018 - Hoatzin's weird characteristics are puzzling to researchers. The Hoatzin Opisthocomus hoazin is the only known bird with a well‐developed foregut plant fermentation system; most fermentation takes place in the crop and caudal oesophagus. It looks like a pheasant or bustard, but emits deep hoarse cries, grunts, groans & hissing sounds.

Swamps, forests, and … Initially, it was assumed that the Hoatzin could eat only arum and mangrove leaves. The larger-than-normal crop contains digestive bacteria which begin the process of fermentation before the leaves reach the bird’s stomach. One of the reasons is that its crop (part of the digestive system) is overly developed and takes more place than in other birds. The bird has a leathery bump on the bottom of its crop which helps in balancing. To test Hoatzin digestive efficiency, balance (total collection) trials with captive Hoatzins were made using two experimental diets of different composition and fibre content. January 1995] Hoatzin Digestive Tract 21 ~~~~~c D Fig. No subspecies are known. Its vegetarian eating habits, clawed wings & crest belong to no other avian species. That is the function of the crop, an enlargement of the oesophagus. They have a callused skin patch on their sternum where they rest their swollen gut (from the fermenting plant material). Unlike other flying birds, its pectoral muscles (muscles on the chest) are poorly developed. "Hoatzins don't seem to follow the rules of evolution," Strahl says. However, the digestive system of the hoatzin seems to work in a manner very similar to that of a cow. Although hoatzin has completely developed wings, it rarely flies.
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