How do birds fly ?

If fire is called ice, ice is called sky, sky is called fire and water is called rain, then where do birds fly?

If 'sky' is 'star', 'star' is 'cloud', 'cloud' is 'earth', 'earth' is 'tree' and 'tree' is 'book' , then where do the birds fly?

If 'star' means 'sky', 'sky' means 'cloud', 'cloud' means 'earth', 'earth' means 'tree' and 'tree' means 'book', then where do the birds fly?

How does the endoskeleton of birds help them to fly?

Which of the following is not an adaptation shown by birds for flying?

Migratory birds fly to far away places because of ____ _ changes.

How does a bird sing?