Birds
Wood Duck
Aix sponsa · also called wood duck
The wood duck is often ranked among the most colourful waterfowl in North America, the male patterned in iridescent green, purple, and chestnut. Nesting high in a tree cavity, its day-old ducklings leap unharmed from heights that would seriously hurt almost anything else their size.
Overview
Wood ducks live in wooded wetlands, swamps, and rivers across much of North America. About 47–54 cm, males show striking iridescent green and purple plumage; females are duller brown. They eat seeds, acorns, aquatic plants, and insects.
A leap of faith
Unlike most ducks, they nest in tree cavities, sometimes many metres up. Within a day of hatching, ducklings tumble to the ground unharmed, then follow their mother to water.
Hunted down, then rebuilt
Overhunting and wetland loss nearly wiped out the species by the early 1900s. Hunting limits and widespread nest box programmes drove a dramatic recovery.
Status
The wood duck is Least Concern and increasing, common across much of its range today.
Wood Duck: common questions
How do wood duck ducklings survive a jump from a tree cavity nest?
Despite the seemingly dangerous height, which can be well over 15 metres in some nests, day-old ducklings are extremely light, covered in fluffy down, and have a body structure that lets them tumble and bounce on impact rather than falling in a rigid, damage-prone way, similar to how a light, soft object survives a fall that would seriously injure something heavier and stiffer. The ground or water below is typically much softer than it looks from above, and the mother duck calls to her ducklings from below to encourage the jump, after which the entire brood usually gathers and follows her to water within hours of hatching, walking overland if necessary.
Why does the wood duck nest in trees instead of on the ground?
Nesting inside an enclosed tree cavity, whether a natural hollow or an old woodpecker hole, offers considerably more protection from ground-based predators such as raccoons, snakes, and foxes than an exposed ground nest would, and wood ducks are well equipped for this lifestyle with sharp, curved claws that let them grip bark and perch securely on branches, unlike most other duck species. This tree-nesting habit does create one obvious challenge, since newly hatched ducklings cannot fly and must instead safely reach the ground or water by jumping, but the trade-off in reduced predation on the vulnerable egg and early incubation stage has clearly proven successful for the species.
How did the wood duck recover from its early 20th-century decline?
A combination of unregulated hunting, driven partly by demand for its striking feathers, and extensive clearance of the forested wetlands it depends on for nesting cavities and food pushed wood duck populations to worryingly low levels across much of its range by the early 1900s. Legal hunting restrictions introduced in the following decades reduced direct mortality, while a large-scale, widely adopted programme encouraging landowners and conservation groups to install artificial nest boxes near suitable wetlands directly addressed the shortage of natural nesting cavities, and together these measures allowed wood duck numbers to rebound substantially over the following decades into the healthy, widespread population seen today.
Why are male wood ducks so much more colourful than females?
This pattern, called sexual dimorphism, is common across many duck species and is generally explained by the different roles and risks faced by each sex during the breeding season. Males use their striking iridescent green, purple, and chestnut plumage primarily in courtship displays to attract a mate and compete with rival males, and since males take no part in incubating eggs or caring for ducklings, their conspicuous colouring carries comparatively little risk. Females, by contrast, need effective camouflage while sitting on a nest and caring for vulnerable young, so their duller brown plumage helps them stay hidden from predators during the periods when they are most exposed.