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Showing posts with label Bat. Show all posts
Showing posts with label Bat. Show all posts

Friday, August 12, 2011

Flying Fox-Malayan


Beauty Of Animal | Flying Fox-Malayan | Bats of the genus Pteropus, belonging to the megabat or Megachiroptera sub-order, are the largest bats in the world. They are commonly known as the Fruit Bats or Flying Foxes among other numerous colloquial names. They live in the tropics and subtropics of Asia (including the Indian subcontinent), Australia, Indonesia, islands off East Africa (but not mainland Africa), and a number of remote oceanic islands in both the Indian and Pacific Oceans.[citation needed] There are at least 60 extant species in this genus.The oldest ancestors of the genus Pteropus to be unearthed appear in the fossil record almost exactly as they are today, the only notable differences being early flight adaptations such as a tail for stabilizing.

 
 

The oldest megachiropteran is dated at around 35 million years ago, but the preceding gap in the fossil record makes their true lineage unknown.Characteristically, all species of flying foxes only feed on nectar, blossom, pollen, and fruit, which explains their limited tropical distribution. They do not possess echolocation, a feature which helps the other sub-order of bats, the Microbats, locate and catch prey such as insects in mid-air. Instead, smell and eyesight are very well-developed in flying foxes. Feeding ranges can reach up to 40 miles. When it locates food, the flying fox "crashes" into foliage and grabs for it. It may also attempt to catch hold of a branch with its hind feet, then swing upside down — once attached and hanging, the fox draws food to its mouth with one of its hind feet or with the clawed thumbs at the top of its wings.Many species are threatened today with extinction, and in particular in the Pacific a number of species have died out as a result of over-harvesting for human consumption. In the Marianas flying fox meat is considered a delicacy, which led to a large commercial trade. In 1989 all species of Pteropus were placed on Appendix II of Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) and at least seven on Appendix I, which restricts international trade. The subspecies P. hypomelanus maris of the Maldives is considered endangered due to limited distribution and excessive culling.

 

The commerce in fruit bats continues either illegally or because of inadequate restrictions. Local farmers may also attack the bats because they feed in their plantations, and in some cultures it is believed their meat can cure asthma. Non-human predators include birds of prey, snakes, and other mammals.The Spectacled Flying Fox, native to Australia, is threatened by the paralysis tick which carries paralyzing toxins.On average, P. vampyrus is the largest species, with a wingspan of up to 6 feet (1.83 meters) but a weight of only 1.5 kg (3.3 lb.). Other species have impressive widths, such as the Indian flying fox (P. giganteus) which has a 5 foot (1.5 meter) wingspan. Pelage is long and silky with a dense underfur. No tail is present. As the name suggests, the head resembles that of a small fox because of the small ears and large eyes. Females have one pair of mammae located in the chest region. Ears are simple (long and pointed) with the outer margin forming an unbroken ring (a defining characteristic of megabats). Toes have sharp curved claws.

 
 

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Sunday, July 31, 2011

Bat-Short-Tailed Fruit


Beauty Of Animal | Bat-Short-Tailed Fruit | Seba's Short-tailed Bat, Carollia perspicillata, is a common and widespread bat species from South and Central America.


C. perspicillata dwells in both moist evergreen and dry deciduous forests, usually below 1,000 meters altitude, typically roosting in groups of 10-100 bats in caves, hollow trees, tunnels, and road culverts. It feeds on a least 50 different species of fruit, as well as pollen and insects.

 
 
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Bat-Common Vampire


Beauty Of Animal | Bat-Common Vampire | Vampire bats tend to live in colonies in almost completely dark places, such as caves, old wells, hollow trees, and buildings. They range in Central to South America and live in arid to humid, tropical and sub tropical areas. Vampire bats live in colonies that can number in the thousands in roosting sites. The basic social structure of roosting bats is made of harems which are composed of females and their offspring and a few adult males, known as "resident males" and a separate group of males, known as "non-resident males". In hairy legged vampire bats, the hierarchical segregation of non-resident males is less strict than in common vampire bats.Non-resident males are accepted into the harems when the ambient temperature lowers. This behavior suggests social thermoregulation.

 
 

Resident males mate with the females in their harems, however it is common for outside males to copulate with the females.Female offspring usually remain in their natal groups unless their mothers die or move. Several matrilines can be found in a group as unrelated females regularly join groups. Male offspring tend to live in their natal groups until they are about two years old, sometimes being forcefully expelled by the resident adult males.

 

Vampire bats are believed to be the only species of bats in the world to "adopt" another young bat if something happens to the bat's mother.Vampire bats also share a strong family bond with members of the colony, which is believed to be why they are the only bats to take up this adoption characteristic. Another unique adaptation of vampire bats is the sharing of food. A vampire bat can only survive about two days without a meal of blood, yet they cannot be guaranteed of finding food every night. This poses a problem, so when a bat fails to find food it will often "beg" another bat for food. The "host" bat may regurgitate a small amount of blood to sustain the other member of the colony. This has been noted by many naturalists as an example of reciprocal altruism in nature.Vampire bats also engage in social grooming.It usually occurs between females and their offspring, but it is also significant between adult females. Social grooming is mostly associated with food sharing.

 
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Monday, July 25, 2011

Vampire Bat

Beauty Of Animals | Vampire Bat  | Vampire bats are bats whose food source is blood, a dietary trait called hematophagy. There are three bat species that feed solely on blood: the Common Vampire Bat (Desmodus rotundus), the Hairy-legged Vampire Bat (Diphylla ecaudata), and the White-winged Vampire Bat (Diaemus youngi). All three species are native to the Americas, ranging from Mexico to Brazil, Chile, and Argentina.
Due to differences between the three species, they have each been placed within a different genus, each consisting of one species. In the older literature, these three genera were placed within a family of their own, Desmodontidae, but taxonomists have now grouped them as a subfamily, the Desmodontinae, in the American leaf-nosed bat family, Phyllostomidae.[citation needed]
The fact that the three known species of vampire bat all seem more similar to one another than to any other species suggests that sanguivorous habits (feeding on blood) evolved only once, and that the three species may share a common ancestor
Unlike fruit-eating bats, the vampire bat has a short, conical muzzle. It also lacks a nose leaf, instead having naked pads with U-shaped grooves at the tip. The common vampire bat also has specialized thermoreceptors on its nose,which aids the animal in locating areas where the blood flows close to the skin of its prey. A nucleus has been found in the brain of vampire bats that has a similar position and similar histology to the infrared receptor of infrared-sensing snakes.
Vampire bats generally have small ears and a short tail membrane. Their front teeth are specialized for cutting and their back teeth are much smaller than in other bats. The inferior colliculus, part of the bat's brain that processes sound, is well adapted to detecting the regular breathing sounds of sleeping animals that serve as their main food source. citation needed

While other bats have almost lost the ability to maneuver, on land, Vampire bats can also run by using a unique bounding gait, in which the forelimbs instead of the hindlimbs are recruited for force production as the wings are much more powerful than the legs. This ability to run seems to have evolved independently within the bat lineage.

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