A large, flightless bird from South America that looks similar to an ostrich but is smaller.
From Greek mythology's Rhea, the Titan mother of the gods, though the connection to the bird is unclear. The scientific name likely referenced classical mythology.
Rheas are the fastest-running birds in South America, reaching 40 mph—and when they run in zig-zag patterns, it's a strategy that actually confuses predators' aim.
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