The Rheas are large ratites (flightless birds without a keel on their sternum bone) in the order Rheiformes, native to South America, related to the ostrich and emu. There are two extant species: the greater or American rhea (Rhea americana) and the lesser or Darwin’s rhea (Rhea pennata).
They have a large range over half of South America but most people will see them most easily in the Pantanal.
LEARN MORE ABOUT RHEAS
VIDEO
I struggled to find anything filmed in the wild but this one in a safari park is pretty good.