A kestrel is also a bird of prey. Tiny, but a falcon nonetheless.
“A kestrel is also a bird of prey..” [FroggyTheGremlim, post 3]
Rolls-Royce named almost all of its reciprocating aero engines after birds of prey or scavengers, beginning with the Eagle in 1915 and concluding with the Griffon, last produced in 1955.
Important as the Merlin was to North American’s P-51, it powered numerous British military aircraft: Fairey Battle, Hawker Hurricane, Supermarine Spitfire, Avro Lancaster, Armstrong-Whitworth Whitley Handley-Page Halifax, Vickers Wellington, Fairey Fulmar, Bristol Beaufighter, Boulto-Paul Defiant, deHavilland Hornet, deHavilland Mosquito, and many more. One version became an armored vehicle powerplant; some powered military transports and civil airliners in the postwar years.