Question

Which one of the following is a flightless bird?
A. Passer
B. Corvus
C. Aptenodytes
D. Pavo cristatus

Answer 1

Those birds who have lost the ability to fly in course of evolution are called flightless birds. There are about 60 species of flightless birds.

Complete answer: In the course of evolution some birds lost the ability of flying. These birds are known as flightless birds. The smallest flightless bird is the inaccessible Island rail and the largest flightless bird is called an ostrich. Passer is the genus of sparrows and they are able to fly. Corvus is the genus having crows, ravens, and rooks and is able to fly. Genus Aptenodytes is the genus of Penguins that are flightless. Pavo cristatus refers to peafowl and they are able to fly for very short distances.

Hence option c) is the correct answer.

Additional Information:
Penguins are a group of aquatic flightless birds that live in the southern hemisphere. There are only one species called the Galapagos penguin. Their body has black and white plumage. They swim in water using flippers. Half of their life is lived on land and the other half in the sea. Emperor penguin is the largest species and the little blue penguin is the smallest species. Monogamous pairing occurs in the breeding season and only one brood is laid in one season. Penguins generally feed on small fishes and krill swimming underwater.

Note: Penguins are flightless birds that belong to the genus Aptenodytes. Corvus (crow) is able to fly, Passer (sparrows) are also able to fly and Pavo cristatus (peafowl) is also able to fly at short distances.