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Bushdog
The bush dog (''Speothos venaticus'') is a canine found in Central and South America. In spite of its extensive range, it is very rare in most areas except in Suriname, Guyana and Peru; it was first described by Peter Wilhelm Lund from fossils in Brazilian caves and was believed to be extinct. The bush dog is the only extant species in the genus '' Speothos'', and genetic evidence suggests that its closest living relative is the maned wolf of central South America or the African wild dog. The species is listed as Near Threatened by the IUCN. In Brazil, it is called ('vinegar dog') and ('bush dog'). In Spanish-speaking countries, it is called ('vinegar dog'), ('vinegar fox'), ('water dog'), and ('shrub or woodland dog'). Description Adult bush dogs have soft long brownish-tan fur, with a lighter reddish tinge on the head, neck and back and a bushy tail, while the underside is dark, sometimes with a lighter throat patch. Younger individuals, however, have black fur o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prague Zoo
Prague Zoological Garden (Czech: ''Zoologická zahrada hl. m. Prahy'') is a zoo in Prague, Czech Republic. It was opened in 1931 with the goal to "advance the study of zoology, protect wildlife, and educate the public" in the district of Troja (Prague), Troja in the north of Prague. In 2013, the zoo occupied with in use for exhibits, and housed around 5,000 animals from 676 species, including 132 species listed as Threatened species, threatened. The zoo is rated as the seventh best zoo in the world by Forbes Travel Guide in 2007, and is rated as the fifth best in the world by TripAdvisor. The zoo has contributed significantly to saving Przewalski's horse; for many years, it was the leading breeder of the subspecies. The zoo director is Miroslav Bobek. History The idea for a zoological garden in Prague was first proposed in 1881 in a newspaper article by Count Sweerts-Spork, on the occasion of the marriage of Crown Prince Rudolf of Austria and Princess Stéphanie of Belgium. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
African Wild Dog
The African wild dog (''Lycaon pictus''), also called painted dog and Cape hunting dog, is a wild canine native to sub-Saharan Africa. It is the largest wild canine in Africa, and the only extant member of the genus '' Lycaon'', which is distinguished from ''Canis'' by dentition highly specialised for a hypercarnivorous diet and by a lack of dewclaws. It is estimated that there are around 6,600 adults (including 1,400 mature individuals) living in 39 subpopulations, all threatened by habitat fragmentation, human persecution and outbreaks of disease. As the largest subpopulation probably consists of fewer than 250 individuals, the African wild dog has been listed as endangered on the IUCN Red List since 1990. The African wild dog is a specialized hunter of terrestrial ungulates, mostly hunting at dawn and dusk, but also displays diurnal activity. It captures its prey by using stamina and cooperative hunting to exhaust them. Its natural competitors are lions and spotted hyenas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diploid
Ploidy () is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes. Here ''sets of chromosomes'' refers to the number of maternal and paternal chromosome copies, respectively, in each homologous chromosome pair—the form in which chromosomes naturally exist. Somatic cells, tissues, and individual organisms can be described according to the number of sets of chromosomes present (the "ploidy level"): monoploid (1 set), diploid (2 sets), triploid (3 sets), tetraploid (4 sets), pentaploid (5 sets), hexaploid (6 sets), heptaploid or septaploid (7 sets), etc. The generic term polyploid is often used to describe cells with three or more sets of chromosomes. Virtually all sexually reproducing organisms are made up of somatic cells that are diploid or greater, but ploidy level may vary widely between different organisms, between different tissues within the same organism, and at different stages in a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discovery Channel
Discovery Channel, known as The Discovery Channel from 1985 to 1995, and often referred to as simply Discovery, is an American cable channel that is best known for its ongoing reality television shows and promotion of pseudoscience. It initially provided documentary television programming focused primarily on popular science, technology, and history, but by the 2010s had become increasingly dominated by programs that were reality television shows, promoted conspiracy theories, or advocated junk science. It is owned by Warner Bros. Discovery, a publicly traded company run by CEO David Zaslav. , Discovery Channel was the third most widely distributed subscription channel in the United States, behind now-sibling channel TBS and the Weather Channel; it is available in 409 million households worldwide, through its U.S. flagship channel and its various owned or licensed television channels internationally. , Discovery Channel is available to approximately 71,000,000 pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Life Of Mammals
''The Life of Mammals'' is a nature documentary series written and presented by David Attenborough, first transmitted in the United Kingdom from 20 November 2002. It is a documentary on the study of the evolution and habits of the various mammal species. It was the fourth of Attenborough's specialised surveys following his major trilogy that began with '' Life on Earth''. Each of the ten episodes looks at one (or several closely related) mammal groups and discusses the different facets of their day-to-day existence and their evolutionary origins. All the programs are of 50 minutes duration except the last, which extends to 59 minutes. The series was produced by the BBC Natural History Unit in conjunction with the Discovery Channel. The executive producer was Mike Salisbury and the music was composed by Dan Jones and Ben Salisbury. It was later shown on the Discovery Channel. Part of David Attenborough's ''Life'' series, it was preceded by '' The Life of Birds'' (1998) and f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scent Gland
Scent gland are exocrine glands found in most mammals. They produce semi-viscous secretions which contain pheromones and other semiochemical compounds. These odor-messengers indicate information such as status, territorial marking, mood, and sexual behaviour. The odor may be subliminal—not consciously detectable. Though it is not their primary function, the salivary glands may also function as scent glands in some animals. In even-toed ungulates The even-toed ungulates (Artiodactyla) have many specialized skin glands, the secretions of which are involved in semiochemical communication. These glands include the sudoriferous glands (located on the forehead, between the antlers and eyes), the preorbital glands (extending from the medial canthus of each eye), the nasal glands (located inside the nostrils), the interdigital glands (located between the toes), the preputial gland (located inside the foreskin of the penis), the metatarsal glands (located outside of the hind legs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mammary Gland
A mammary gland is an exocrine gland that produces milk in humans and other mammals. Mammals get their name from the Latin word ''mamma'', "breast". The mammary glands are arranged in organs such as the breasts in primates (for example, humans and chimpanzees), the udder in ruminants (for example, cows, goats, sheep, and deer), and the dugs of other animals (for example, dogs and cats) to feed young offspring. Lactorrhea, the occasional production of milk by the glands, can occur in any mammal, but in most mammals, lactation, the production of enough milk for nursing, occurs only in phenotypic females who have gestated in recent months or years. It is directed by hormonal guidance from sex steroids. In a few mammalian species, male lactation can occur. With humans, male lactation can occur only under specific circumstances. Mammals are divided into 3 groups: monotremes, metatherians, and eutherians. In the case of monotremes, their mammary glands are modified seba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carnassial
Carnassials are paired upper and lower teeth modified in such a way as to allow enlarged and often self-sharpening edges to pass by each other in a shearing manner. This adaptation is found in carnivorans, where the carnassials are the modified fourth upper premolar and the first lower molar (tooth), molar. These teeth are also referred to as sectorial teeth. Taxonomy The name carnivoran is applied to a member of the order Carnivora. Carnivorans possess a common arrangement of teeth called carnassials, in which the first lower Molar (tooth), molar and the last upper premolar possess blade-like enamel Crown (tooth), crowns that act similar to a pair of shears for cutting meat. This dental arrangement has been modified by adaptation over the past 60 million years for diets composed of meat, for crushing vegetation, or for the loss of the carnassial function altogether found in pinnipeds. Carnassial dentition Carnassial teeth are modified molars (and in the case of carnivorans pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Talonid
The molars or molar teeth are large, flat teeth at the back of the mouth. They are more developed in mammals. They are used primarily to grind food during chewing. The name ''molar'' derives from Latin, ''molaris dens'', meaning "millstone tooth", from ''mola'', millstone and ''dens'', tooth. Molars show a great deal of diversity in size and shape across the mammal groups. The third molar of humans is sometimes vestigial. Human anatomy In humans, the molar teeth have either four or five cusps. Adult humans have 12 molars, in four groups of three at the back of the mouth. The third, rearmost molar in each group is called a wisdom tooth. It is the last tooth to appear, breaking through the front of the gum at about the age of 20, although this varies among individuals and populations, and in many cases the tooth is missing. The human mouth contains upper (maxillary) and lower (mandibular) molars. They are: maxillary first molar, maxillary second molar, maxillary third molar, man ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unicuspid
A unicuspid is a tooth that has only one cusp. In shrews The dental formulas of shrews are distinguished by the number of unicuspids. All shrews have (in one half of each jaw) one large incisor followed by a variable number of unicuspids, followed by a complex premolar, followed by three molars. All shrews except for those of the genus ''Myosorex'' have one lower unicuspid; ''Myosorex'' has two. The genera '' Blarina'', '' Blarinella'', and ''Sorex'' have five upper unicuspids. The genera ''Myosorex'', '' Feroculus'', '' Scutisorex'', '' Suncus'', ''Sylvisorex'', '' Ruwenzorisorex'', '' Cryptotis'', '' Neomys'', '' Soriculus'', and '' Episoriculus'' have four upper unicuspids. The genera '' Congosorex'', '' Surdisorex'', '' Solisorex'', '' Paracrocidura'', ''Crocidura'', ''Chimarrogale'', ''Chodsigoa ''Chodsigoa'' is a genus of shrews in the tribe Nectogalini. Species There are currently ten species classified under the genus ''Chodsigoa'': *Van Sung's shrew (''Chodsigoa ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dhole
The dhole ( ; ''Cuon alpinus'') is a canid native to South, East and Southeast Asia. It is anatomically distinguished from members of the genus ''Canis'' in several aspects: its skull is convex rather than concave in profile, it lacks a third lower molar, and the upper molars possess only a single cusp as opposed to between two and four. During the Pleistocene, the dhole ranged throughout Asia, with its range also extending into Europe (with a single putative, controversial record also reported from North America) but became restricted to its historical range 12,000–18,000 years ago. It is now extinct in Central Asia, parts of Southeast Asia, and possibly the Korean peninsula and Russia. Genetic evidence indicates that the dhole was the result of reticulate evolution, emerging from the hybridization between a species closely related to genus ''Canis'' and one from a lineage closely related to the African wild dog (''Lycaon pictus''). The dhole is a highly social ani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
