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Cleaning Symbiosis
Cleaning symbiosis is a mutually beneficial association between individuals of two species, where one (the cleaner) removes and eats parasites and other materials from the surface of the other (the client). Cleaning symbiosis is well-known among marine fish, where some small species of cleaner fish, notably wrasses but also species in other genera, are specialised to feed almost exclusively by cleaning larger fish and other marine animals. Other cleaning symbioses exist between birds and mammals, and in other groups. Cleaning behaviour was first described by the Greek historian Herodotus in about 420 BCE, though his example (birds serving crocodiles) appears to occur only rarely. The role of cleaning symbioses has been debated by biologists for over thirty years. Some believe that cleaning represents selfless co-operation, essentially pure mutualism, increasing the fitness of both individuals. Others such as Robert Trivers hold that it illustrates mutual selfishness, reciproc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yellow-billed Oxpecker
The yellow-billed oxpecker (''Buphagus africanus'') is a passerine bird in the family Buphagidae. It was previously placed in the starling and myna family, Sturnidae. It is native to the savannah of Sub-Saharan Africa from Senegal east to Sudan. It is least common in the extreme east of its range where it overlaps with the red-billed oxpecker, despite always dominating that species when feeding. Taxonomy In 1760 the French zoologist Mathurin Jacques Brisson included a description of the yellow-billed oxpecker in his ''Ornithologie'' based on a specimen collected in Senegal. He used the French name ''Le pique-boeuf'' and the Latin ''Buphagus''. The two stars (**) at the start of the section indicates that Brisson based his description on the examination of a specimen. Although Brisson coined Latin names, these do not conform to the binomial system and are not recognised by the International Commission on Zoological Nomenclature. When in 1766 the Swedish naturalist Carl Linnaeu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mutualism (biology)
Mutualism describes the ecological interaction between two or more species where each species has a net benefit. Mutualism is a common type of ecological interaction. Prominent examples include most vascular plants engaged in mutualistic interactions with mycorrhizae, flowering plants being pollinated by animals, vascular plants being dispersed by animals, and corals with zooxanthellae, among many others. Mutualism can be contrasted with interspecific competition, in which each species experiences ''reduced'' fitness, and exploitation, or parasitism, in which one species benefits at the expense of the other. The term ''mutualism'' was introduced by Pierre-Joseph van Beneden in his 1876 book ''Animal Parasites and Messmates'' to mean "mutual aid among species". Mutualism is often conflated with two other types of ecological phenomena: cooperation and symbiosis. Cooperation most commonly refers to increases in fitness through within-species (intraspecific) interactions, alth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water Dikkop
The water thick-knee or water dikkop (''Burhinus vermiculatus'') is a species of bird in the thick-knee family Burhinidae. The species is found across sub-Saharan Africa, usually close to water. Distribution and habitat The water thick-knee has a widespread distribution in sub-Saharan Africa, being found in Angola, Botswana, Burkina Faso, Burundi, Cameroon, Central African Republic, Republic of the Congo, Democratic Republic of the Congo, Eswatini, Ivory Coast, Ethiopia, Gabon, Ghana, Kenya, Liberia, Malawi, Mozambique, Namibia, Niger, Nigeria, Rwanda, Senegal, Somalia, South Africa, Tanzania, Uganda, Zambia, and Zimbabwe. Across its range it is found on the edges of lakes, estuaries and rivers, as well as mangroves and also some sheltered beaches. It also needs bushes or nearby woodlands for shelter. It is found from sea-level to . Description left, A captive bird stretching its wings The water thick-knee is and weighs . It has a heavy bill that is black with yellow at th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nile Crocodile
The Nile crocodile (''Crocodylus niloticus'') is a large crocodilian native to freshwater habitats in Africa, where it is present in 26 countries. It is widely distributed throughout sub-Saharan Africa, occurring mostly in the central, eastern, and southern regions of the continent, and lives in different types of aquatic environments such as lakes, rivers, swamps, and marshlands. In West Africa, it occurs along with two other crocodilians. Although capable of living in saline environments, this species is rarely found in saltwater, but occasionally inhabits deltas and brackish lakes. The range of this species once stretched northward throughout the Nile, as far north as the Nile Delta. On average, the adult male Nile crocodile is between in length and weighs including stomach stones. However, specimens exceeding in length and weighing up to have been recorded. It is the largest freshwater predator in Africa, and may be considered the second-largest extant reptile in the worl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Philip Sclater
Philip Lutley Sclater (4 November 1829 – 27 June 1913) was an England, English lawyer and zoologist. In zoology, he was an expert ornithologist, and identified the main zoogeographic regions of the world. He was Secretary of the Zoological Society of London for 42 years, from 1860–1902. Early life Sclater was born at Tangier Park, in Wootton St Lawrence, Hampshire, where his father William Lutley Sclater had a country house. George Sclater-Booth, 1st Baron Basing was Philip's elder brother. Philip grew up at Hoddington House where he took an early interest in birds. He was educated in school at Twyford and at thirteen went to Winchester College and later Corpus Christi College, Oxford where he studied scientific ornithology under Hugh Edwin Strickland. In 1851 he began to study law and was admitted a Fellow of Corpus Christi College. In 1856 he travelled to America and visited Lake Superior and the upper St. Croix River (Wisconsin–Minnesota), St. Croix River, cano ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spur-winged Plover
The spur-winged lapwing or spur-winged plover (''Vanellus spinosus'') is a lapwing species, one of a group of largish waders in the family Charadriidae. It is one of several species of wader supposed to be the "trochilus" bird said by Herodotus to have been involved in an unattested cleaning symbiosis with the Nile crocodile. Distribution The spur-winged lapwing breeds around the eastern Mediterranean, and in a wide band from sub-Saharan west Africa to Arabia. The Greek and Turkish breeders are migratory, but other populations are resident. The species is declining in its northern range, but is abundant in much of tropical Africa, being seen at almost any wetland habitat in its range. The spur-winged lapwing is one of the species to which the ''Agreement on the Conservation of African-Eurasian Migratory Waterbirds'' applies. In eastern and southern Africa the species has seen a range increase, entering Zambia for the first time in 1999 and spreading south and west. Descripti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Cook
Thomas Cook (22 November 1808 – 18 July 1892) was an English businessman. He is best known for founding the travel agency Thomas Cook & Son. He was also one of the initial developers of the "package tour" including travel, accommodations, and the like. Early life Thomas Cook was born on 22 November 1808, to John and Elizabeth Cook, who lived at 9 Quick Close in the village of Melbourne, Derbyshire. At the age of 10, Cook started working as an assistant to a local market gardener on Lord Melbourne's estate. In 1828, he became a Baptist missionary and toured the region as a village evangelist and distributing pamphlets and, in the 1830s, he became involved in the temperance movement. On 2 March 1833, Cook married Marianne Mason (1807–1884) at the parish church in Barrowden in Rutland. A son, John Mason Cook, was born on 13 January 1834. A daughter, Annie Elizabeth, born on 21 June 1845, died in a bath aged 35 after inhaling poisonous fumes from a faulty water heate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Scherren
Henry James Wilson Scherren (10 February 1843 – 25 April 1911), usually known as Henry Scherren or in encyclopaedia articles as H. Sc. was the author of various books on natural history for adults and children, with notable illustrations including some in colour, and a contributor to the Encyclopædia Britannica on natural history topics. He was a fellow of the Zoological Society of London, of which he wrote a magnificent but inaccurate history. Life Scherren's family came from Weymouth in Dorset. The son of a bookseller and printer, he became a compositor and moved to London. After being educated at the new St. Joseph's Foreign Missionary College started by the Mill Hill Missionaries, he joined the Catholic Carthusian monastic order in France. However, he abandoned the order in his mid-thirties to return to secular life, going on to work on the editorial staff of Messrs. Cassell & Co. in London for two decades. In the mid-1890s he moved, with his wife Anna, into a three-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandpiper
Sandpipers are a large family, Scolopacidae, of waders. They include many species called sandpipers, as well as those called by names such as curlew and snipe. The majority of these species eat small invertebrates picked out of the mud or soil. Different lengths of bills enable different species to feed in the same habitat, particularly on the coast, without direct competition for food. Sandpipers have long bodies and legs, and narrow wings. Most species have a narrow bill, but otherwise the form and length are quite variable. They are small to medium-sized birds, measuring in length. The bills are sensitive, allowing the birds to feel the mud and sand as they probe for food. They generally have dull plumage, with cryptic brown, grey, or streaked patterns, although some display brighter colours during the breeding season. Most species nest in open areas, and defend their territories with aerial displays. The nest itself is a simple scrape in the ground, in which the bird t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leech
Leeches are segmented parasitism, parasitic or Predation, predatory worms that comprise the Class (biology), subclass Hirudinea within the phylum Annelida. They are closely related to the Oligochaeta, oligochaetes, which include the earthworm, and like them have soft, muscular segmented bodies that can lengthen and contract. Both groups are hermaphrodites and have a clitellum, but leeches typically differ from the oligochaetes in having suckers at both ends and in having ring markings that do not correspond with their internal segmentation. The body is muscular and relatively solid, and the coelom, the spacious body cavity found in other annelids, is reduced to small channels. The majority of leeches live in freshwater habitats, while some species can be found in terrestrial or marine environments. The best-known species, such as the medicinal leech, ''Hirudo medicinalis'', are hematophagous, attaching themselves to a host with a sucker and feeding on blood, having first secr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crocodile
Crocodiles (family Crocodylidae) or true crocodiles are large semiaquatic reptiles that live throughout the tropics in Africa, Asia, the Americas and Australia. The term crocodile is sometimes used even more loosely to include all extant members of the order Crocodilia, which includes the alligators and caimans (family Alligatoridae), the gharial and false gharial (family Gavialidae) among other extinct taxa. Although they appear similar, crocodiles, alligators and the gharial belong to separate biological families. The gharial, with its narrow snout, is easier to distinguish, while morphological differences are more difficult to spot in crocodiles and alligators. The most obvious external differences are visible in the head, with crocodiles having narrower and longer heads, with a more V-shaped than a U-shaped snout compared to alligators and caimans. Another obvious trait is that the upper and lower jaws of the crocodiles are the same width, and the teeth in the lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
