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Wednesday, September 24, 2014
Big hippo's eating hay in 4K
Big hippo's eating hay in 4K - Hippopotamus - The hippopotamus (Hippopotamus amphibius), or hippo, is a large, mostly herbivorous mammal in sub-Saharan Africa, and one of only two extant species in the family Hippopotamidae (the other is the pygmy hippopotamus). The name comes from the ancient Greek for "river horse" (ἱπποπόταμος). After the elephant and rhinoceros, the hippopotamus is the third-largest type of land mammal and the heaviest extant artiodactyl. Despite their physical resemblance to pigs and other terrestrial even-toed ungulates, their closest living relatives are cetaceans (whales, porpoises, etc.) from which they diverged about 55 million years ago. The common ancestor of whales and hippos split from other even-toed ungulates around 60 million years ago. The earliest known hippopotamus fossils, belonging to the genus Kenyapotamus in Africa, date to around 16 million years ago.
Hippos are recognizable by their barrel-shaped torsos, enormous mouths and teeth, nearly hairless bodies, stubby legs and great size, adults average 1,500 kg (3,300 lb) and 1,300 kg (2,900 lb) for males and females respectively. Despite its stocky shape and short legs it can easily outrun a human, being capable of reaching 30 km/h (19 mph) over short distances. The hippopotamus is one of the most aggressive and unpredictable creatures in the world and, as such, ranks among the most dangerous animals in Africa. Nevertheless, they are still threatened by habitat loss and poaching for their meat and ivory canine teeth.
The hippopotamus is semiaquatic, inhabiting rivers, lakes and mangrove swamps, where territorial bulls preside over a stretch of river and groups of five to 30 females and young. During the day, they remain cool by staying in the water or mud; reproduction and childbirth both occur in water. They emerge at dusk to graze on grasses. While hippopotamuses rest near each other in the water, grazing is a solitary activity and hippos are not territorial on land.
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Monday, September 22, 2014
White horse eating grass in 4K
White horse eating grass in 4K - White horses are born white and stay white throughout their life. White horses may have brown, blue, or hazel eyes. "True white" horses, especially those that carry one of the dominant white (W) genes, are rare. Most horses that are commonly referred to as "white" are actually "gray" horses whose hair coats are completely white.[1]
White horses have unpigmented skin and a white hair coat. Many white horses have dark eyes, though some have blue eyes. In contrast to gray horses which are born with pigmented skin they keep for life and pigmented hair that lightens to white with age, truly white horses are born with mostly white skin and white hair. Some white horses will have partial pigmentation in their skin and hair, which may or may not be retained as they mature, but if they lighten, unlike grays where only the hair becomes white, in a true white horse both skin and hair lose pigmentation.
White colorings, whether white markings, white patterns or dominant white are collectively known as depigmentation phenotypes, and are all caused by areas of skin that lack pigment cells (melanocytes).[2] Depigmentation phenotypes have various genetic causes, and those that have been studied usually map to the EDNRB and KIT genes. However, much about the genetics behind various all-white depigmentation phenotypes are still unknown.
Dominant white[edit]
The genetics behind this white Thoroughbred, and her white family members, are not yet understood.
Main article: Dominant white
Dominant white is best known for producing pink-skinned all-white horses with brown eyes, though some dominant white horses have residual pigment along the topline. Dominant white is, as the name implies, a genetically dominant color. At least one parent must be dominant white and it does not "skip" generations because it is not recessive. Nonetheless, new variations or mutations producing dominant white do occur spontaneously from time to time. Dominant white is rare, but has occurred in many breeds. It has been studied in Thoroughbreds, Arabian horses, the American White horse and the Camarillo White horse. There are 11 identified variants of dominant white, each corresponding to a spontaneously-white foundation animal and a mutation on the KIT gene. No horse has been identified as homozygous dominant white, and researchers have suggested that at least some forms of dominant white results in nonviable embryos in the homozygous state. While homologous mutations in mice are often linked to anemia and sterility, no such effects have been observed in dominant white horses. Dominant white horses typically have white noses that can be subject to sunburn.
Sabino-white[edit]
Main article: Sabino horse
Sabino-white horses are pink-skinned with all-white or nearly-white coats and dark eyes. They are homozygous for the dominant SB1 allele at the Sabino 1 locus, which has been mapped to KIT.[3] Without a DNA test, Sabino-white horses are indistinguishable from dominant white horses. The Sabino1 allele, and the associated spotting pattern, is found in Miniature horses, American Quarter Horses, American Paint Horses, Tennessee Walkers, Missouri Fox Trotters, Mustangs, Shetland Ponies, and Aztecas.[4] Sabino 1 has not been found in the Arabian horse, Clydesdale,[3] Thoroughbred, Standardbred horse, or Shire horse. The Sabino 1 allele is not linked to any health defects, though sabino-whites may need some protection from sunburn. Horses with only one copy of the Sabino1 gene usually have dramatic spotting, including two or more white legs, often with white running up the front of the leg, extensive white on the face, spotting on the midsection, and jagged or roaned margins to the pattern.[3]
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Saturday, September 20, 2014
Africa Zoo - Stunning beautiful teddy bear with funny ears 4K
Africa Zoo Stunning beautiful teddy bear with funny ears - The Eurasian brown bear (Ursus arctos arctos) is a subspecies of brown bear, found across northern Eurasia. The Eurasian brown bear is also known as the common brown bear, European brown bear, European bear and colloquially by many other names.
The Eurasian brown bear has brown fur, which can range from yellow-brownish to dark brown, red brown, and almost black in some cases; albinism has also been recorded.The fur is dense to varying degree and the hair can grow up to 10 cm in length. The shape of the head is normally quite round with relatively small and round ears, a wide skull and a mouth equipped with 42 teeth, including predatory teeth. It has a powerful bone structure, large paws, equipped with big claws, which can grow up to 10 cm in length. The weight varies depending on habitat and time of the year. A full grown male weighs on average no more than 250 and 300 kilograms (550 and 660 lb).The largest Eurasian brown bear recorded was 481 kg (1,058 lb) and was nearly 2.5 m (8.2 ft) long. Females typically range between 150–250 kg (330–550 lb).
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Friday, September 19, 2014
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