Answer:

rheas

Answer	Crossword Clue
RHEAS	Ostrich relatives
RHEAS	Ostrich cousins
RHEAS	South American ratites

RHEAS	Birds caught by gauchos
RHEAS	Large flightless birds
RHEAS	Flightless South American birds
RHEAS	Ostrichlike birds
RHEAS	Three-toed birds
RHEAS	Flightless birds
RHEAS	Birds named for a Greek titan
RHEAS	Relatives of emus

RHEAS	Three-toed ratites
RHEAS	Argentinian ostrich relatives
RHEAS	Emus' cousins
RHEAS	Ostrich look-alikes
RHEAS	Ostriches' kin
RHEAS	Big birds
RHEAS	Grounded birds
RHEAS	Big birds that can't fly

RHEAS	Birds that can't fly
RHEAS	Large birds
RHEAS	Cassowary cousins
RHEAS	Flightless birds of South America
RHEAS	Some flightless birds
RHEAS	Ostrich's cousins
RHEAS	South American runners
RHEAS	Birds named from the Greek for "ground"

RHEAS	Ostriches.
RHEAS	So. Amer. ostriches.
RHEAS	Three-toed, flightless birds.
RHEAS	Large birds.
RHEAS	Nandus.
RHEAS	Nonflying birds.
RHEAS	American ostriches.
RHEAS	Largest of So. American birds.

RHEAS	South American birds.
RHEAS	Nandus
RHEAS	Big S.A. birds
RHEAS	Ratite birds
RHEAS	Ostriches' cousins