The First __ of Spring Heralds the New Season
Puzzle 17 of Animals with Weird Names Hard Pack
Question is: The First __ of Spring Heralds the New Season
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.