Ospreys are specialized fish eaters, and fish make up almost their entire diet.
Adaptations for Fishing:
Powerful talons grip slippery fish.
Reversed toes provide an excellent hold.
Exceptional eyesight spots fish from the air.
Diving ability lets them plunge into water at high speed.
It is extremely rare for ospreys to eat anything other than fish. Anecdotal reports of reptiles, amphibians, or birds are opportunistic, not regular behavior.
Their specialized adaptations make them highly efficient fish hunters.