Overview
Darwin’s Rhea (Rhea pennata), also known as the lesser rhea or choique, is an iconic large flightless ratite roaming the desolate, wind-swept plains of Patagonia and high-altitude Andean puna. Famously documented by Charles Darwin during the voyage of the HMS Beagle, this fleet-footed bird is built for survival in arid, sub-freezing grasslands where temperatures swing drastically and ground vegetation is sparse.
Biology and Physical Characteristics
Standing roughly one meter tall, Darwin’s rhea is slightly smaller than the greater rhea. Its plumage is a mottled grayish-brown, generously tipped with brilliant white feather points that create a spangled appearance. Unlike many running birds, its tarsus is feathered along the upper portion to insulate against freezing Patagonian gales. Powerful three-toed feet allow it to reach sprinting speeds of up to 37 mph (60 km/h) across rugged uneven ground.
Behavior and Ecology
These ratites are highly social, traveling in mixed flocks that forage on drought-tolerant shrubs, berries, roots, and grass seeds. Reproduction is characterized by intense male parental investment: during spring, a dominant cock courts a harem of females who deposit their eggs into a single communal scrape excavated by the male. The male undertakes all incubation duties for roughly 40 days, fiercely defending the nest and subsequently rearing the striped chicks alone.
Conservation and Human Impact
While evaluated as Least Concern overall due to its extensive southern distribution, isolated northern Andean subspecies face ongoing pressures. Historical threats include excessive hunting for meat and plumage, as well as egg collection. Contemporary conservation concerns focus on extensive wire sheep fences that hinder migration corridors and competition with commercial livestock. Rewilding initiatives in Chilean and Argentine national parks are restoring protected grasslands.
Interesting Factoid
When sprinting away from predators like pumas at full speed, Darwin’s rhea abruptly flares its wings outward like rudders to execute sharp 90-degree zig-zag turns, baffling pursuit on open plains.
Last updated: October 2026