page_title: Huia
section_title: Feeding and ecology
hierarchical_section_title: Huia / Ecology and behaviour / Feeding and ecology
caption_attribution_description: Photo by Charlotte Simmonds of huhu grubs in a rotten pine wood. They are the larvae of the huhu beetle, Prionoplus reticularis, the largest endemic beetle of New Zealand, a member of the longhorn beetle family Cerambycidae. The whitish larvae are up to 70 millimetres (2.8&#160;in) long. They are edible and are said by some to taste like buttery chicken.Čeština: Larvy novozélandského brouka huhu, druh Prionoplus reticularis
context_page_description: The huia is an extinct species of New Zealand wattlebird, endemic to the North Island of New Zealand. The last confirmed sighting of a huia was in 1907, although there were credible sightings as late as the early 1960s.
  Its extinction had two primary causes. The first was rampant overhunting to procure huia skins for mounted specimens and their tail feathers for hat decorations. The second major cause was the widespread deforestation of the lowlands of the North Island by European settlers to create pasture for agriculture. Most of these forests were ancient, ecologically complex primary forests, and huia were unable to survive in regenerating secondary forests.
  It was already a rare bird before the arrival of Europeans, confined to the Ruahine, Tararua, Rimutaka and Kaimanawa mountain ranges in the south-east of the North Island. It was remarkable for having the most pronounced sexual dimorphism in bill shape of any bird species in the world. The female's beak was long, thin and arched downward, while the male's was short and stout, like that of a crow. Males were 45 cm long, while females were larger at 48 cm.
context_section_description: The huia, with the previously endangered saddleback, were the two species of classic bark and wood probers in the arboreal insectivore guild in the New Zealand avifauna. Woodpeckers do not occur east of Wallace's line; their ecological niche is filled by other groups of birds that feed on wood-boring beetle larvae, albeit in rotting wood. The woodpecker-like role was taken on by two species in two different families in the New Zealand mixed-podocarp and Nothofagus forests; one was the huia and the other was the kaka.
  The huia foraged mainly on decaying wood. Although it was considered a specialist predator of the larvae of the nocturnal huhu beetle (Prionoplus reticularis), it also ate other insects—including wētā—insect larvae, spiders, and fruit.
  Insects and spiders were taken from decaying wood, from under bark, mosses and lichens, and from the ground. Huia foraged either alone, in pairs, or in small flocks of up to five, which were probably family groups. The sexual dimorphism of the bill structure gave rise to feeding strategies that differed radically between the sexes. The male used its adze-like bill to chisel and rip into the outer layers of decaying wood, while the female probed areas inaccessible to the male, such as the burrows of insect larvae in living wood. The male had well-developed cranial musculature allowing rotten wood to be chiselled and pried apart by "gaping" motions. There are corresponding differences in the structure and musculature of the head and neck between males and females. Huia had very well developed depressor jaw muscles, and an occipital crest that provided extra surface for muscle attachment, allowing the jaw to be opened with considerable force. Once the bird had secured a meal, it flew to a perch with the insect in its feet. The huia stripped its meal of any hard parts, then tossed the remainder up, caught, and swallowed it.
  Pairs did not cooperate in feeding, at least not in a strict sense. All such reports are based on misunderstanding of an account by ornithologist Walter Buller of a pair kept in captivity obtaining wood-boring beetle larvae. According to this misunderstanding, which has become part of ecological folklore, the male would tear at the wood and open larval tunnels, thus allowing the female to probe deeply into the tunnels with her long, pliant bill. Rather, the divergent bills represent an extreme example of niche differentiation, reducing intraspecific competition between the sexes. This allowed the species to exploit a wide range of food sources in different microhabitats.
  The New Zealand forest relies heavily on frugivorous birds for seed dispersal: about 70% of the woody plants have fruits that are probably dispersed by birds, which included the huia. The range of fruits eaten by the huia is difficult to establish: hinau (Elaeocarpus dentatus), pigeonwood (Hedycarya arborea) and various species of Coprosma are recorded by Buller, and they were also recorded as eating the fruits of kahikatea (Dacrycarpus dacrydioides). The extinction of the huia and other frugivorous New Zealand bird species including the moa and piopio, and the diminishing range of many others, including the kiwi, weka, and kōkako, has left few effective seed dispersers in the New Zealand forest. For plants with fruit greater than 1 cm in diameter, kereru are the sole remaining dispersers in the ecosystem, and they are rare or extinct in some areas. This depletion of avifauna in the forest ecosystem may be having major impacts on processes such as forest regeneration and seed dispersal.
caption: A favourite food of the huia: the larvae of the huhu beetle, Prionoplus reticularis
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