Monday, 24 February 2020
Sunday, 23 February 2020
2-8-2017 BUDAPEST ZOO, HUNGARY - CENTRAL BEARDED DRAGON (Pogona vitticeps)
Central bearded dragons (Pogona vitticeps) are agamid lizards found in eastern and central Australia. They live in areas where food may be hard to find and need to bask in the sun to maintain elevated body temperatures.
Central bearded dragons vary widely in color, including brown, reddish-brown, red, yellow, white, and orange. They are capable of undergoing moderate changes in coloration, and scales along both sides of the throat, neck, and head form a row of narrow spines that runs down each side of the body to the tail. Males typically have a darker "beard" than females, and during mating season and courtship, it will typically darken to near-black. Bearded dragons, like most agamid lizards, have strong legs which enable them to lift their body completely off the ground while they move. This is done to reduce the heat taken in from the ground, as well as to increase the airflow over the belly to cool itself further. Males can be distinguished from females by a wider cloacal opening, a wider base of the tail, a larger head and beard, and the possession of hemipenes. Males also have more pronounced femoral pores than females (these can be seen as waxy bumps on the underside of the back legs).
Central bearded dragons are widely distributed over eastern and central parts of Australia, being found from the southeastern Northern Territory the eastern part of southern Australia. They live in very diverse habitats including deserts, dry forests, and scrublands. These dragons are semi-arboreal animals, often seen basking on picnic tables, fence posts, or fallen branches.
Normally, these animals are diurnal. Nevertheless, after hot days they can be frequently seen out on roads. The Central bearded dragon is an excellent climber, often found perched in bushes as well as on branches of trees and fence posts, spending as much time perching as it does on the ground. They are not social animals, though sometimes they congregate into groups to feed and bask. Gathering in groups, they follow a certain hierarchy: when basking, usually the highest-ranking individuals take the sunniest and highest spots and the rest of the group gets lower spots. Females often use their beards for aggression displays while males will display their beards during the mating season as a part of the courtship ritual. When feeling threatened, bearded dragons flatten their bodies against the ground, puff out their spiny throats, and open their jaws to make themselves appear larger.
Saturday, 22 February 2020
Friday, 21 February 2020
Thursday, 20 February 2020
20-2-2010 OLIVA CANAL LES FONTS, VALENCIA - RED EARED SLIDER TERRAPIN (Trachemys scripta ssp. elegans)
The red-eared slider or red-eared terrapin (Trachemys scripta elegans) is a subspecies of the pond slider (Trachemys scripta), a semiaquatic turtle belonging to the family Emydidae. It is the most popular pet turtle in the United States, is also popular as a pet across the rest of the world, and is the most invasive turtle. It is the most commonly traded turtle in the world.
The red-eared slider is native from the Midwestern United States to northern Mexico, but has become established in other places because of pet releases, and has become invasive in many areas where it outcompetes native species. The red-eared slider is included in the list of the world's 100 most invasive species.
Invasive red-eared sliders cause negative impacts in the ecosystems they are introduced to because they have certain advantages over the native populations, such as a lower age at maturity, higher fecundity rates, and larger body size, which gives them a competitive advantage at basking and nesting sites, as well as when exploiting food resources. They also transmit diseases and displace the other turtle species with which they compete for food and breeding space.
Owing to their popularity as pets, red-eared sliders have been released or escaped into the wild in many parts of the world. This turtle is considered one of the world's worst invasive species. Feral populations are now found in Bermuda, Canada, Australia, Europe, Great Britain, South Africa, the Caribbean Islands, Israel, Bahrain, the Mariana Islands, Guam, Russia, and south- and far-east Asia. Within Great Britain, red-eared sliders have a wide distribution throughout England, Scotland, and Wales.
In Australia, it is illegal for members of the public to import, keep, trade, or release red-eared sliders, as they are regarded as an invasive species – see below. Their import has also been banned by the European Union as well as specific EU member countries. In 2015, Japan announced it was planning to ban the import of red-eared sliders, but it would probably not take effect until 2020.
Red-eared sliders do not hibernate, but actually brumate; while they become less active, they do occasionally rise to the surface for food or air. Brumation can occur to varying degrees. In the wild, red-eared sliders brumate over the winter at the bottoms of ponds or shallow lakes. They generally become inactive in October, when temperatures fall below 10 °C (50 °F). During this time, the turtles enter a state of sopor, during which they do not eat or defecate, they remain nearly motionless, and the frequency of their breathing falls. Individuals usually brumate under water, but they have also been found under banks and rocks, and in hollow stumps. In warmer winter climates, they can become active and come to the surface for basking. When the temperature begins to drop again, however, they quickly return to a brumation state. Sliders generally come up for food in early March to as late as the end of April.
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