Birds generally has hollow bones . These hollow bones make their body light weight . Their light body help them to fly high in the sky.
But not all birds can fly at high altitudes. some are just able to achieve height up to branches of trees.
Let’s take an example , Eagle who can fly at very high altitudes. But ostriches are unable to fly. Because of heavy body weight.
Sparrows can fly faster and at higher altitudes because of light body weight. Humming bird faster among all birds.
Peacock eats insects as their food. Peacock is consider as National Bird of india. Its beauty make surrounding wonderful, pleasant atmosphere.
Delhi ranked 2nd among cities for most no. Of species of birds.