Bird That Lays Eggs in Another Bird's Nest
This page is the CodyCross answer for the clue below from Underground Worlds, Group 2172, Puzzle 1 (Oxygen Detector).
Question is: Bird That Lays Eggs in Another Bird's Nest
and the answer is: CUCKOO
Word Meaning:
CUCKOO — Any of various birds, of the family Cuculidae within the order Cuculiformes, famous for laying its eggs in the nests of other species; but especially a common cuckoo (Cuculus canorus), that has a characteristic two-note call.
Definitions from Wiktionary.