Answer:

aviaries

Answer	Crossword Clue
AVIARIES	Bird enclosures
AVIARIES	Zoo structures
AVIARIES	They're for the birds

AVIARIES	Homes in zoos.
AVIARIES	Zoo features.
AVIARIES	Zoo features
AVIARIES	Birds' homes
AVIARIES	Zoo sections

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.