Brown Teal

Fascinating facts about the Brown Teal

• A single female lays between four and eight creamy-brown eggs, and the mother alone incubates them for 27–30 days, a tight schedule that means every successful brood is a crucial boost for a population of fewer than 1,000 adults.
• Genetic surveys revealed that the original captive stock from Great Barrier Island carried only one haplotype, while the wild Mimiwhangata population still holds eleven, highlighting a hidden loss of genetic diversity that could limit long-term resilience.
• Since 2017, Project Janszoon has released just under 300 birds into the Awapoto River in Abel Tasman National Park, and the fledglings are now breeding there, proving that targeted re-introductions can rebuild wild colonies even on the mainland.
• Brown teal are unusually nocturnal for dabbling ducks, a behavioral shift that evolved to avoid daytime hunters like the New Zealand falcon, yet it leaves them vulnerable to night-time predators such as cats and stoats, underscoring the need for predator-free sanctuaries.

At a glance

About the Brown Teal

The brown teal (Anas chlorotis), known in Māori as pāteke, glides through New Zealand’s wetlands with a mottled brown head and throat, a white eye ring, and, in the breeding season, the male dons a flash of green on his head, a chestnut breast and a striking white stripe along each side. Their plumage is otherwise uniform across sexes and ages, making them subtle masters of camouflage among reeds and tussocks. Primarily nocturnal, these dabbling ducks have adapted to the shadows to evade diurnal raptors such as the New Zealand falcon, Eyles' harrier and skuas, yet they remain vulnerable to introduced predators that hunt by scent and sound. By day they linger near water, feeding on aquatic insects, larvae and crustaceans, but at night they venture onto land to forage, even crushing small molluscs like pipi (Paphies australis) whole. A truly surprising trait is their unique method of extracting flesh from larger cockles such as Austrovenus stutchburyi: they wedge their soft bills between the shells and employ a jackhammer-like pumping motion, a technique undocumented in any other bird. Their nests, hidden in dry grass or under dense Carex, hold four to eight creamy-brown eggs, incubated solely by the female for 27–30 days while the male guards the territory, ever-watchful for intruding waterfowl.

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