It is the act of traveling or moving through the air. Harder - Humans first observed flight in other animals in the natural world. Birds have wings and most have the ability to fly.
Many insects can fly.
Only one mammal can fly, the bat. However both the flying squirrel and the flying lemur can glide. Humans experimented and developed ways of flying. They had built their airplane after studying the writings of other aviation pioneers and experimenting with gliders, kites, and wind tunnels. Thrust is created by a plane's propeller or its jet engines.