Question

The largest bird is
A. Pavo
B. Struthio
C. Pelican
D. None of the above

Answer 1

Hint:- Birds (also referred to as Aves) are the warm-blooded vertebrates comprising toothless jaws and fore-limb modified into wings comprising feathers. These have four-chambered hearts, have high metabolic rate, lay hard-shelled eggs and strong yet light-weight bones. The size of the birds can range from 5 cm (smallest) to 2.75 m (largest).

Complete step-by-step solution:- The birds have a great variety in their size, features and functions. The birds can be as tiny and as huge, can be flightless or adaptive to swimming and fastest to the slowest.
Birds are oviparous (or egg laying), i.e., they produce offspring by laying eggs which are fertilized by sexual reproduction.
The largest and the strongest living birds is the African ostrich which is scientifically known as Struthio camelus. These are the biggest and the flightless birds which do not have wings to fly. The adult male is about 2.75 meters (about 9 feet) tall, wherein almost half of its height is neck and weighs more than 150 kg and the females are somewhat smaller. The ostriches lay one of the largest eggs (6-8 inches long).
Pavo (commonly known as peacock) is the bird with the brightest colourful feathers which help them to fly short distances.
The pelicans/ Australian pelicans (Pelicanus conspicillatus) has the longest bills (about 13-18.5 inches long).
So, the correct option is B

Note:- Some birds are flightless (e.g. penguin, kiwi and ostrich) but are modified to their environments accordingly. Whereas, some birds are adapted for swimming and comprise modification in the body accordingly (e.g. water birds and seabirds). The male bee hummingbirds (Mellisuga helenae) is the smallest bird (weigh 0.056 ounces and are 2.75 inches in length)