Wednesday 29 December 2010 Patagonian Mara - A Little Bit of Everything

The Patagonian Mara (Dolichotis patagonum) lives in south and central Argentina mainly in areas of scrub desert or coarse grassland. It is a rodent resembling a short eared hare also called the Patagonian hare or Patagonian cavy but is actually a close relative of the guinea pig. It is one of the few rodents that mate for life, and its social structure is based on this. Pairs will travel everywhere together with the female in the lead and the male watching out for danger.

They usually keep to themselves except during breeding time. At that time they will share a burrow with other families with litters. The burrows are dug by the females. The pups are born well developed with open eyes. The female will identify her young by smell and lead them a little distance from the burrow to suckle. The male watches over the family at this time for predators. This unique social organization is thought to give more protection to the young. They live up to 10 to 15 years.

The third largest rodent in the world, the Patagonian Mara is 69 - 75 cm (about 2 feet) long. It can run very fast for its size, up to 45 kilometers (28 miles) per hour for distances over 1 kilometer, because it has powerful hind legs. The front legs are adapted for digging their burrows with four sharp claws. When fully grown they stand about 2 feet (.61 meters) at the shoulder, are 2.5 feet (.76 of a meter) long and weigh 35 pounds (15.88 kilograms).

The Patagonian Mara is gradually heading for the endangered species list. Its habitat is being cleared for agriculture and it is in competition for the green vegetation it eats with sheep and the European hare that have been introduced to the region. It is hunted by birds of prey, snakes and some mammals. Some localized populations have already become extinct. It is living in at least 12 protected areas at the present time. It is classified NT (near threatened) on the IUCN Red List.

This mammal seems to be a strange combination of several animals. They are fast runners like rabbits, and they can hop 6 feet into the air when startled. They walk like deer, and have some of the same coloring of deer or antelope with white on their underside and tail. They fold their front paws like a cat when resting in the sun. Their face resembles a kangaroo.

Picture of the Patagonian mara by Luis Argerich, licensed under the Creative Commons Attribution 2.0 Generic license. You can help spreading the word about this animal by liking it on facebook

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Thursday 23 December 2010 Brush-tailed Phascogale - A Bottle Brush for a Tail

The Brush-tailed Phascogale (Phascogale tapoatafa) is a mammal about the size of a large rat found only in certain areas of Australia: New South Wales, Queensland and the Northern Territory. Also known as the Common Wambenger (!) or the Tuan, the Brush-tailed Phascogale is best known for the tuft of silky black hairs at the end of its long tail.

Description
The body, legs, and head of the Brush-tailed Phascogale are covered by a deep grizzled-grey fur, with a pale creamy undercoat. The rat-like head is crowned with large bare pointed ears. The tail, usually as long as the body, ends in a tuft of black hair much like a kitchen bottle brush. The average male is 15.8" (401 mm) long, and weighs 7 ounces (199 grams); the average female is 13.9" (352 mm) long and weighs 4.7 ounces (145 grams).

Habitat
The Brush-tailed Phascogale prefers areas with an annual rainfall over 20" (500 mm), in such regions as open forests, swamps, and rain forests. This marsupial is a very agile climber of trees, and often hangs head down from branches. The Brush-tailed Phascogale nests in tree hollows lined with shredded bark and leaves, often moving to many different hollows over their short lifetimes.

Position in Food Chain
An nocturnal hunter, the Brush-tailed Phascogale eats insects, spiders, beetles, cockroaches, and centipedes, and occasionally a small lizard or bird. They are the prey of the red fox and all types of cats.

Reproduction
Males, after being weaned, travel long distances to establish their own territories; females usually stay where they are born. When the time comes to mate, around June or July, the male travels long distances to find a female. A male dies almost immediately after mating season is over, around the age of one year.

Females, however, live longer, up to three years, but produce only one litter in their lifetime. Nesting in the hollow of a tree, an expectant female will, within thirty days, bear a litter of seven or eight young, who will spend their first seven weeks in their mother's marsupial pouch. Once the young leave the pouch, they will stay in the nest for five more months, until they are weaned.

Species Vulnerability
Originally, the Brush-tailed Phascogale was well-established throughout Australia. But, because of the destruction of their natural habitat, and continual predation, these marsupials have disappeared from most of Australia. The species is officially listed as having a "Near Threatened" status. You can help spreading the word about this animal by liking it on facebook

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Monday 20 December 2010 Giant Noctule - Preying on nocturnal birds

The Giant Noctule (Nyctalus lasiopterus) is a rare, flying mammal also known as the Greater Noctule Bat. They are found scattered around the Iberian Peninsula in southwest Europe, the Balkans in southeastern Europe, and the Ural region in western Russia. They have also been spotted in Morocco and Libya in northern Africa, as well as in Turkey, northern Iran, and Kazakhstan.

These bats weigh approximately 1.7 ounces (50 grams), and possess a wingspan of up to 23 inches (60 cm). Despite their small stature, they are surprisingly predatory, and small passerine birds who migrate at night are in danger. Within the past decade, it has been found that Giant Noctules chase, catch, and eat fowl prey while in flight.

They use echolocation to navigate, forage, and hunt in the dark. They echolocate within specific frequency ranges that are above the hearing range of birds, which gives the bats the upper hand during the hunt. They fly higher up in the air, upwards of .3 miles (500 meters) to find prey, and researchers believe that spring and autumn, peak months for bird migration, are prime hunting seasons for these predatory bats.

During peak migration periods, the diet of Giant Noctules consists largely of passerine, or small perching birds. These birds are caught and eaten on the wing, in mid-air during flight, rather than from nests or perches. This species is the only known bat species that feeds like this, see also this article. Insects are also an important source of food. They have a few natural predators in the wild including owls, which can capture bats during flight, just as Giant Noctules capture passerine birds.

They are native to certain countries in Europe, North Africa, and West Asia including Spain, France, Bulgaria, Romania, and the Ukraine. Their natural habitat consists of mixed and deciduous forests, as well as wooded river valleys. The Giant Noctules are highly dependent on mature woodlands containing old trees. They use hollow trees to roost in summertime, and rock crevices during the winter months, which are a time of hibernation. Old buildings are also common roosting sites.

Giant Noctules are considered to be a near threatened animal. Their population appears to be decreasing due largely to deforestation. In particular, the loss of old trees, which are crucial to supporting bat c/div>