b) Order: Coraciiform (crow or raven forms ) Some of the members of this order can also filter their food.Įxamples: wild duck or mallard, common teal, swan, mergansers, etc. They graze on short grasses in nearby lakes. Their foot is fully webbed to help capture the prey. Their body compact with a long neck and has black bars on the head. They are large in size with a heavyweight. The birds are highly aquatic and can fly up to some meters above the ground surface. This order includes aquatic birds such as geese, swans, and ducks. The orders included in this are: a) Order: Anseriformes (goose form ) Some commute to land for spawning but return to the water for further development. These kinds of birds reside in the aquatic medium and also dive into the water. The young birds born out of eggs are well developed comparatively and have an ability to run and swim.Įxamples of birds are the Ostriches, emus, rheas. Their eggs have thick shells and they maintain communal nests with other birds. The adults are herbivores, while the young ones are omnivores, i.e., they eat insects and plant material. As a result, they have a lower metabolic rate than the other birds with the ability to fly. They lack keeled sterna and have underdeveloped breast muscles. (The exception is the kiwis which are small in size with smaller legs.) They are quite large in size compared to other birds with long and strong legs. ![]() This includes those birds which cannot fly. Other examples: koel, crow-pheasant, etc. ![]() The sexual dimorphism is conspicuous in cuckoo. The male cuckoo sings in a melodious voice during summers.Ĭuckoo is a nest parasite, and they rely on other birds to hatch their eggs and grow their siblings. The female cuckoo is brown with white spots over the body. The bird is about the size of a crow with similar color in appearance. ![]() The bird is well known for its melodious voice. This order includes all cuckoos and their allied forms.
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