Kingfisher n. : Any one of numerous species of birds constituting the family Alcedinidae. Most of them feed upon fishes which they capture by diving and seizing then with the beak; others feed only upon reptiles, insects, etc. About one hundred and fifty species are known. They are found in nearly all parts of the world, but are particularly abundant in the East Indies.

Example:
I caught a Kingfisher which was stuck in a tree and the crows were going to kill it. What do I do now?

Taxonomy
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Defination from the web:
Kingfisher (Megaceryle maxima), at an average of 355 g (13.5 oz) and 45 cm (18 inches). However, the familiar Australian kingfisher known as the Laughing Kookaburra (Dacelo novaeguineae) may be the heaviest species, since large ...