How birds started to fly

Birds started flying by leaping and gliding as they ran along the ground, similar to how turkeys fly today. Another theory suggests that birds used wings and feathers to climb steep slopes or tree trunks and evolved into flying. Some theories propose that birds used feathers and wing structures to glide from tree to tree like flying squirrels. Feathers, initially evolved for warmth, became essential in the evolution of flight. Feathers and specialized wing structures allow birds to fly in cool ways.