Males do all the warming work. After the female lays her huge egg, the male alone incubates it, developing a feather-less brood patch to transfer heat more efficiently. He leaves the nest for only about five hours a day, half the foraging time of non-incubating birds, and even camouflages the entrance with leaves and soil. 94 % of kiwi chicks die without pest control.
At the tip of the kiwi's 13-20.5 cm long beak lies a dense array of Herbst corpuscles that detect minute vibrations and pressure changes in the soil. This tactile organ lets the bird locate earthworms and spiders in total darkness, compensating for its tiny visual field, the smallest recorded among birds.
In 1996 the North Island brown kiwi numbered about 35,000, but by 2006 the count had fallen to 20,000. In a 2006 1080-poison operation in Tongariro Forest, 57 % of radio-tagged chicks survived to adulthood, far above the national average of 5 %. The adult population there has almost doubled since 1998.
They can live in pine plantations as well as native forest. Though historically tied to dense indigenous lowland forest, brown kiwis now occupy exotic pine forests, overgrown pastures, sand dunes and regenerating patches, selecting small pockets of suitable cover within larger unsuitable areas. Observations suggest body weight and breeding success in these non-native habitats match those in pristine forest.
The North Island brown kiwi lays eggs that measure 12.5 cm × 7.8 cm and weigh about 430 g. so each clutch is limited to two eggs on average.
Sources
Every fact above was checked against these pages, and kept only where one of them states it.
In the shadowy depths of New Zealand's forests, the kiwi moves with stealthy purpose, its long, probing beak twitching as it navigates the underbrush with an uncanny sensitivity. With its soft, hair-like feathers and diminutive stature, this enigmatic bird seems almost otherworldly, its nocturnal wanderings a testament to its remarkable adaptability in a world where the pressures of extinction loom large. As it snuffles and snorts, its large, round eyes drinking in the faint light, the kiwi embodies a unique and captivating spirit, a true marvel of evolutionary ingenuity.
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