Mandarin ducks carry 84 chromosomes, all acrocentric, while most other ducks have only 80 and many are submetacentric. This extra set makes hybridising with other duck species extremely hard, possibly impossible. The chromosome difference also explains why verified hybrids are rare and still debated among scientists.
By the 1980s, wild Mandarin duck numbers had plummeted to fewer than 1,000 breeding pairs each in eastern Russia and China, while Japan still held about 5,000 pairs. A 2009 survey raised the Chinese estimate to 12,000-14,000 birds. In Britain, an introduced feral population now numbers around 7,000, illustrating how human-mediated escapes can create sizable new colonies far from the species' native range.
Mandarin ducks lay a single clutch of nine to twelve eggs each spring, usually in April or May, and the female alone incubates them for 28 to 30 days. When the chicks hatch, the mother calls them to the ground; each duckling then leaps from the tree cavity in a free-fall that leaves them unharmed and ready to head for nearby water.
In Northeast China's Zuojia Nature Reserve, 46.1% of Mandarin ducks were observed practicing conspecific brood parasitism, laying eggs in the nests of relatives or other species. This strategy lets females cut down on the energy and danger of incubating their own clutch, while still boosting the total number of offspring produced each generation.
Introduced Mandarin ducks in the UK have caused no measurable harm to local wildfowl populations. However, as their range expands they could begin to compete with the common goldeneye, another tree-nesting duck, for nesting sites.
Sources
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In the misty dawn of oriental wetlands, the Mandarin Duck emerges, its resplendent plumage a kaleidoscope of emerald, amber, and crimson, as if the very essence of the forest has taken flight. With feathers rustling softly, it glides across the water's surface, its webbed feet paddling in a slow, hypnotic rhythm, leaving behind a trail of rippled silk. As it navigates the serene landscape, the Mandarin Duck's extraordinary beauty and tranquil demeanor render it a vision of elegance, a true marvel of evolutionary artistry.
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