Birds normally use wing beat to fly in the air ...

... USAF F-15 fighter jets use aircraft turbine engines, which can produce 50,000 pounds of thrust (25,000 each).

Spangdahlem US AIR Base Open House 2011 (3)

[fc-foto:25392004][fc-foto:25391838]

Canon PowerShot G11, 6.1-30.5 mm, 6.1 mm, 4, 1/250, 0