Flight or flying is a process of movement of the object in a gaseous environment or a vacuum without contact with the surface of another environment, as is possible with the use of jet thrust, or other means of propulsion, and without it (by inertia). Best adapted for long controlled powered flight are flying birds and insects, and mammals of the order Chiroptera and extinct reptiles of the order pterosaurs. All of these animals use the aerodynamic principles of flight, using the load-bearing properties of the wing. There are also many animals that make gliding and parachute flight, such as spiders web, aeroplankton flying clams and flying fish, intending to use the ear or leather folds, mammals and reptiles. The fastest flying animal is the peregrine falcon. The speed of its dive is over .