Editing Rhea (bird) (section)

===Reproduction===
Rheas are polygynandrous, with males courting between two and twelve females and females commonly mating with multiple dominant males during the breeding season. After mating, the male builds a nest where each female lays eggs. The nest is a simple scrape in the ground, lined with grass and leaves.<ref name=EoB/> The male incubates from ten to sixty eggs. The male will use a decoy system and place some eggs outside the nest, then sacrifice these to predators so they do not attempt to get inside the nest. The male may use another subordinate male to incubate his eggs while he finds another group of females to start a second nest with.<ref name="Davies"/> The chicks hatch within 36 hours of each other. Right before hatching, the chicks begin to whistle.<ref>{{Cite web|date=2020-01-27|title=Listen: Greater Rhea Nests Are Filled With Dozens of Whistling Eggs|url=https://www.audubon.org/news/listen-greater-rhea-nests-are-filled-dozens-whistling-eggs|access-date=2022-01-26|website=Audubon|language=en}}</ref> The group of females, meanwhile, may move on and mate with other males. While caring for the young, the males will charge at any perceived threat approaching the chicks, including female rheas and humans. The young reach full adult size in about six months but do not breed until they reach two years of age.<ref name="EoB"/>