They have lighter bones than humans that allow them to be lifted off of the ground.
Birds have developed the trait of being warm blooded to maintain their homeostasis. This means that their body maintains a certain temperature, so that the organs can stay warm.
Past tense: The flock of birds was flying. Present tense: The flock of birds is flying. (flock is a collective noun)
Think of it as the same thing as land mammals versus water mammals. Marine mammals first evolved to life on land and then adapted to return to the water, but not all mammals did that. Similar thing with birds. All birds evolved from common flying ancestors, whereas flying mammals evolved from land mammals at a much later point in evolutionary history. Hope that helps.
Birds feel colder when they are flying
Chickens can fly , but they are low flying birds.
Flying birds are not always larger. There are many bats bigger than many kinds of birds.
Birds Flying Away was created in 2000-01.
they have wings
10%
Humming Birds
swimming
A Swallow has a very streamlined body meaning it can fly much faster
Noel Gallagher's High Flying Birds was created in 2010.