Nocturnal Bird With Wide, Amphibian-Type Gape

Puzzle 19 of The 1950s Hard Pack

Question is: Nocturnal Bird With Wide, Amphibian-Type Gape

and the answer is: FROGMOUTH

Word Meaning:

FROGMOUTH — Any of several nocturnal, insectivorous birds, of the family Podargidae in the order Podargiformes, native to Australia and southern Asia

Definitions from Wiktionary.