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Whitehead (bird)
The whitehead (''Mohoua albicilla''; ) is a small species (15 cm in length, 18.5/14.5 g.Barrie Heather and Hugh Robertson, ''The Field Guide to the Birds of New Zealand'' (revised edition), Viking, 2005) of passerine bird endemic to New Zealand. It is classified in the family Mohouidae. The male whitehead's upperparts, wings and tail are a pale brown in colour, while the head and underparts are white – in the case of the male an almost pure white in colour. Females and juveniles have similar colouration except that the nape and crown (top of the head) are shaded brown.R.A. Falla, R.B. Sibson and E.G. Turbott, ''The New Guide to the Birds of New Zealand'', Collins, 1979 The black beak and eyes contrast with the white head and the feet are bluish black in colouration. Formerly quite common and widespread in native forests in the North Island, the whitehead has suffered a marked decline in the past two centuries since European colonisation and today it is restricted to a fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allopatric
Allopatric speciation () – also referred to as geographic speciation, vicariant speciation, or its earlier name the dumbbell model – is a mode of speciation that occurs when biological populations become geographically isolated from each other to an extent that prevents or interferes with gene flow. Various geographic changes can arise such as the movement of continents, and the formation of mountains, islands, bodies of water, or glaciers. Human activity such as agriculture or developments can also change the distribution of species populations. These factors can substantially alter a region's geography, resulting in the separation of a species population into isolated subpopulations. The vicariant populations then undergo genetic changes as they become subjected to different selective pressures, experience genetic drift, and accumulate different mutations in the separated populations' gene pools. The barriers prevent the exchange of genetic information between ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tieke
The saddlebacks or tīeke (Māori) are two species of New Zealand birds of the family Callaeidae. Both are glossy black with a chestnut saddle. Their taxonomic family is also known as that of the (New Zealand) "wattlebirds" and includes the two species of kōkako, and the extinct huia. All members of the family Callaeidae have coloured fleshy wattles on either side of the beak; the saddlebacks' are a vivid red. Taxonomy The genus ''Philesturnus'' was introduced in 1832 by the French zoologist Isidore Geoffroy Saint-Hilaire to accommodate a single species, the South Island saddleback, which is therefore the type species of the genus. The name combines the honeyeater genus ''Philedon'' and the starling genus ''Sturnus''. The saddleback's common name derives from the demarcated brown plumage on its back, which resembles a saddle. The Māori name, , is onomatopoeic and comes from one of the species' calls: "ti-e-ke-ke-ke-ke". There are two species: * North Island saddleback � ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mixed-species Feeding Flock
A mixed-species feeding flock, also termed a mixed-species foraging flock, mixed hunting party or informally bird wave, is a flock of usually insectivorous birds of different species that join each other and move together while foraging. These are different from feeding aggregations, which are congregations of several species of bird at areas of high food availability. While it is currently unknown how mixed-species foraging flocks originate, researchers have proposed a few mechanisms for their initiation. Many believe that nuclear species play a vital role in mixed-species flock initiation. Additionally, the forest structure is hypothesized to play a vital role in these flocks' formation. In Sri Lanka, for example, vocal mimicry by the greater racket-tailed drongo might have a key role in the initiation of mixed-species foraging flocks, while in parts of the American tropics packs of foraging golden-crowned warblers might play the same role. Composition Mixed-species foragin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yellowhead (bird)
The yellowhead or mohua (''Mohoua ochrocephala'') is a small insectivorous passerine bird endemism, endemic to the South Island of New Zealand. Once a common forest bird, its numbers declined drastically after the introduction of Black rat, rats and stoats, and it is now near threatened. Taxonomy The yellowhead was Species description, formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's ''Systema Naturae''. He placed it with the flycatchers in the genus ''Muscicapa'' and coined the binomial nomenclature, binomial name ''Muscicapa ochrocephala''. The specific epithet is derived from the Ancient Greek ''ōkhros'' meaning "pale yellow" and ''-kephalos'' meaning "-headed". Gmelin based his account on the "yellow-headed fly-catcher" that had been described in 1783 by the English ornithologist John Latham (ornithologist), John Latham in his book ''A General Synopsis of Birds''. The naturalist Joseph Banks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Melicytus Ramiflorus
''Melicytus ramiflorus'', commonly known as māhoe, is a small tree of the family Violaceae. It is endemic (ecology), endemic to New Zealand. It grows up to 10 metres high with a trunk up to 60 cm in diameter, it has smooth, light bark and brittle twigs. The dark-green "alternate" leaves are 5–15 cm long and 3–5 cm wide and their edges are finely serrated (although this feature is less pronounced in younger plants). The plants are dioecious and the small flowers are yellowish in colouration, between 3 and 4 mm in diameter and occur in Fascicle (botany), fascicles, growing straight out from naked twigs- these flowers have a strong, pleasant fragrance. The berries are a striking violet colour when ripe and are more or less spherical with a diameter of between 3 and 4 mm. Flowering occurs in late spring and on into summer while the berries appear later on in summer and also in autumn. The berries of ''M. ramiflorus'' are eaten by a number of native bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subcanopy
In biology, the canopy is the aboveground portion of a plant cropping or crop, formed by the collection of individual plant crowns. In forest ecology, the canopy is the upper layer or habitat zone, formed by mature tree crowns and including other biological organisms (epiphytes, lianas, arboreal animals, etc.). The communities that inhabit the canopy layer are thought to be involved in maintaining forest diversity, resilience, and functioning. Shade trees normally have a dense canopy that blocks light from lower growing plants. Early observations of canopies were made from the ground using binoculars or by examining fallen material. Researchers would sometimes erroneously rely on extrapolation by using more reachable samples taken from the understory. In some cases, they would use unconventional methods such as chairs suspended on vines or hot-air dirigibles, among others. Modern technology, including adapted mountaineering gear, has made canopy observation significantl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canopy (biology)
In biology, the canopy is the aboveground portion of a plant community, plant cropping or crop, formed by the collection of individual Crown (botany), plant crowns. In forest ecology, the canopy is the upper layer or habitat zone, formed by mature tree crowns and including other biological organisms (epiphytes, lianas, Arboreal, arboreal animals, etc.). The communities that inhabit the canopy layer are thought to be involved in maintaining forest diversity, Ecological resilience, resilience, and functioning. Shade trees normally have a dense canopy that blocks light from lower growing plants. Early observations of canopies were made from the ground using binoculars or by examining fallen material. Researchers would sometimes erroneously rely on extrapolation by using more reachable samples taken from the understory. In some cases, they would use unconventional methods such as chairs suspended on vines or hot-air dirigibles, among others. Modern technology, including adapted ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gleaning (birds)
Gleaning is a feeding strategy by birds and bats in which they catch invertebrate prey, mainly arthropods, by plucking them from foliage or the ground, from crevices such as rock faces and under the eaves of houses, or even, as in the case of ticks and lice, from living animals. This behavior is contrasted with Hawking (birds), hawking insects from the air or chasing after moving insects such as ants. Gleaning, in birds, does not refer to foraging for seeds or fruit. Gleaning is a common feeding strategy for some groups of birds, including nuthatches, Tit (bird), tits (including chickadees), wrens, Ovenbird (family), woodcreepers, treecreepers, Old World flycatchers, Tyrant flycatchers, Old World babbler, babblers, Old World warblers, New World warblers, Vireos and some hummingbirds and cuckoos. Many birds make use of multiple feeding strategies, depending on the availability of different sources of food and opportunities of the moment. Techniques and adaptations Foliage glea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arboreal
Arboreal locomotion is the locomotion of animals in trees. In habitats in which trees are present, animals have evolved to move in them. Some animals may scale trees only occasionally (scansorial), but others are exclusively arboreal. The habitats pose numerous mechanical challenges to animals moving through them and lead to a variety of anatomical, behavioral and ecological consequences as well as variations throughout different species. Cartmill, M. (1985). "Climbing". pp. 73–88 ''In'': Hildebrand, Milton; Bramble, Dennis M.; Liem, Karel F.; Wake, David B. (editors) (1985). ''Functional Vertebrate Morphology''. Cambridge, Massachusetts: Belknap Press. 544 pp. . Furthermore, many of these same principles may be applied to climbing without trees, such as on rock piles or mountains. Some animals are exclusively arboreal in habitat, such as tree snails. Biomechanics Arboreal habitats pose numerous mechanical challenges to animals moving in them, which have been solved in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insectivorous
A robber fly eating a hoverfly An insectivore is a carnivorous animal or plant which eats insects. An alternative term is entomophage, which can also refer to the human practice of eating insects. The first vertebrate insectivores were amphibians. When they evolved 400 million years ago, the first amphibians were piscivores, with numerous sharp conical teeth, much like a modern crocodile. The same tooth arrangement is however also suited for eating animals with exoskeletons, thus the ability to eat insects can stem from piscivory. At one time, insectivorous mammals were scientifically classified in an order called Insectivora. This order is now abandoned, as not all insectivorous mammals are closely related. Most of the Insectivora taxa have been reclassified; those that have not yet been reclassified and found to be truly related to each other remain in the order Eulipotyphla. Although individually small, insects exist in enormous numbers. Insects make up ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
