Geese are wetland birds belonging to the family Anatidae. The primary dietary items of geese in the spring and summer are freshwater vegetation, grasses and sedges. Winter food items consist of fruits and berries. Some herbivorous goose species are the Canada goose, Chinese goose, African goose and swan goose. Geese are largely migratory birds, flying to warmer climates in the winter. When nesting, geese usually find locations near the edge of lakes and rivers; a goose's nest is made of mud and grass.
Found in Central and South America, macaws are true parrot birds and live in tropical environments such as rain forests, grasslands and swamps. Most macaws are omnivorous; however, some of these tropical birds only eat plants, tree nuts, berries and grasses. Two herbivorous macaws are in the Ara genus - blue and green macaws and scarlet macaws - and another, the hyacinth macaw, is in the Anodorhynchus genus. At over 40 inches long, the hyacinth macaw is the largest macaw in the world. One particular food macaws eat is from Syagrus commosa and Attalea funifera species of palm trees.
Known for their colorful crests - plumage on their heads - cockatoos are parrot species found in rain forests and grasslands throughout Southeast Asia and Australia. Cockatoos feed on roots, grasses, nuts and fruits. Some cockatoos, including the Major Mitchell's and long-billed corellas, use their beaks to forage for nuts within trees such as Acacia and Callitris. Cockatoos belong in the Cacatuidae family of birds. Other herbivorous Cacatuidae bird species are the glossy black, red-vented and sulfur-crested cockatoos. When threatened, cockatoos hiss to ward off humans and predators.
Also known as the flying cow, the hoatzin is a tropical forest bird found in South America's rain forests and swamps. This bird has a spiky crest on top of its head and multicolored plumage on its body. Hoatzins are known as flying cows due to their awkward method of flying. These tropical birds eat fruits, plants and berries. The hoatzin bird relies on foregut fermentation for digestion, meaning they have two stomachs, which is similar to cows and sheep. To defend themselves, hoatzins emit foul odors and have claws on the end of their wings to help them climb trees.