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The hoatzin is a folivore—it eats the leaves (and to a lesser degree, the fruits and flowers) of the plants that grow in its marshy and riverine habitat. It clambers around along the branches in its search for food. The hoatzin uses a leathery “bump” on the bottom of its crop to help balance its weight on the branches.
A hoatzin. It has been observed that folivory is extremely rare among flying vertebrates. [2] Morton (1978) attributed this to the fact that leaves are heavy, slow to digest, and contain little energy relative to other foods. [2] The hoatzin is an example of a flighted, folivorous bird. There are, however, many species of folivorous flying insects.
The Hoatzin is pheasant-sized, but much slimmer. It has a long tail and neck, but a small head with an unfeathered blue face and red eyes which are topped by a spiky crest. It is a weak flier which is found in the swamps of the Amazon and Orinoco rivers. Hoatzin, Opisthocomus hoazin
You might want to read the original source, keeping in mind that galliforms were one of the earliest group of modern landbirds to evolve, whereas the Hoatzin originated at least (and only if the Metaves are good) about a dozen or so million years later. If the Metaves are not good, it originated probably many tens of millions of years later.
Studies like the one PETA referenced, conducted by biologist Victoria Braithwaite, showed fish's behavior changed when given painful stimuli and they expressed avoidance if a tissue was injured.
Punxsutawney Phil's year-by-year record: Just how accurate are his forecasts? When is Groundhog Day? What time does it start? Groundhog Day is on Sunday, Feb. 2. Phil is expected to make his ...
The good news is there are foods that are packed with nutrients that have been shown to support brain health and cognition. And you don’t have to knock yourself out to find them.
Inopinaves is a clade of neoavian birds recovered in a compressive genomic systematic study using nearly 200 species in 2015. It contains the clades Opisthocomiformes and Telluraves (core landbirds); the study shows that the hoatzin diverged from other birds 64 million years ago. [2]