Showing posts with label territories. Show all posts
Showing posts with label territories. Show all posts

Sunday, 15 July 2012

BEARS




AMERICAN BLACK BEAR
Most of the times bears are slow and shuffling along. However, the grizzly can speed up from ambling along to a 50km/h in no time. For an animal generally living on berries it is incredible strong. It had been known that they snap a moose’s back with one swipe of their paws or carry a deer in their mouth uphill.

It has a dense fur and adds a lot of weight to the bear’s body. It is the largest carnivores. Their heavily build bodies had a massive skulls, short, powerful limbs with long, sharp claws. Their rears and eyes are small but their muzzle is large emphasizing their superb smelling powers.  Their lips cover loosely their long canines and broad, flat molars for grinding and crushing.

Their diet exists mostly of berries and vegetation but now and then they do eat meat.  They great opportunist’s feeders.

Polar Bears due to its environments eats mainly fish and seals.

Bears are widespread. They live in the Tundra, coasts, tropical jungles and mountain forests. They don’t live in Africa, Antarctic and Australia.

When food is scarce, like in colder climates, the bears den up. They live off their body fat in the meantime but they do not hibernate. They are in lethargic state to avoid eating. During these winter months tiny cubs are born. Those bears living in a warmer climate where food is always available do not stay in a den except for pregnant females.

They are seven species of bear in the family of Ursideae. Three species the brown, polar and American black bear belong to the same genus Ursus.  The four remaining species the Asian black, sloth, sun and spectacled bear are belonging to four separate genera.

BROWN BEAR


The brown bear is the biggest of all bears. However, the brown bears can vary in weight and sizes depending on habitats and food availability. The American brown bears can weigh up to 400kg. The males are 80 per cent heavier than the females.

The American brown bear shows its full size when it stands up. The Kodiak subspecies from the Kodiak, Adognak and Shuyak Islands off Alaska are mot probably the biggest of the brown bear. They can weigh upto 1000kg and stand up to 3.4m tall The Siberian or Kamchatkan brown bear is nearly the same size.

This Spanish brown bear weighs between 80 and 300 kg.

To build-up these massive body weights it has to eat a great quantity. It can be up to 16kg a day. Their main diet is grasses, berries, shoots and tubers. If they get the chance they eat also carrion, insects, rodents, catch fish and chase to kill caribou including deer as big as an elk.

On a whole brown bears are very intolerant. They will just about have company where there is plenty of food such at rivers when the salmon spawning or waste dumps.

BLACK BEARS


The American black bears are like the brown bears in size and habits. It lives in forests from New Mexico to Alaska. Its coat is shorter and has a variety of colours. They are black, various browns, blue-grey and incredible but true in cream.

To survive the winter they have to eat enormously to build up their body fat and breed successfully. In order to do this they cover a great area. They feed on berries, tubers, nuts, shoots, insect larvae, carrion and fish.  They are very attracted to orchards, picnic baskets and beehives. On a whole they live a life in the slow lane. The exception is when they see a deer or beaver they would like for their meal.

The females lives alone or with their young ones in territories. They will give a signal to males with scented urines and the males are moving into their area. The female, after mating, will move into a den for the winter. There she gives birth to two or three naked cubs. When it gets warmer again they emerge. The young ones will stay with their mother for about one and a half year. After that they will move out and lead a solitary life.

POLAR BEARS

The polar bear stands up to 3m and weighs up to 600kg. The hug white bears living on the North poleis the largest and fiercest of carnivorous land mammals. It waits at the breathing holes of its main food supply, the seal. The polar bear slaps it when the seal emerges for air. It also attacks at their breeding dens or on ice flows. They also eat dead whales, attack beluga whales and walruses. They number one seal are the ringed seal but will not ignore the bearded, hooded and harp seals.

Polar bears live alone and cover huge areas to find food. When the food is scarce they will also eat small mammals, births, eggs and vegetation. Males seek out females in the mating season.

Mother Nature provided them with great adaptation for their hostile environments. The short ears prevent heat loss and they are covered with white fur except their nose and feet pads. The white fur not only serves as a camouflage but it is a great insulation and water repellent. The bear is a great swimmer with its dense coat protecting against icy water, streamline shaped body and partially webbed feet.

The pregnant female digs a den in bit snowdrifts where she gives birth to 1-3 cubs. Cubs live with their mother for two year and then go to find their own territory.

Wednesday, 18 April 2012

OTTERS



Otters are found everywhere but not in the Antarctic and Australasia. There are 12 different species and live in any water, salt or fresh. As well as very good swimmers they are equally at home on land.
As a matter of fact they belong to the weasel family and otters are its only amphibious member. Although, they are different species yet they look quite similar. Just to give you an example, the oriental short-clawed otter measures 66cm in length but the giant otter measures 140cm.
However, all otters have a streamlined body and a small head with a thick, tapered tail. The short legs have mostly webbed paws, with very sharp claws. This comes in useful for catching fishes and holding them. Their fur has under the long guard hair a dense underlayer which makes the coat water repellent.
The otters are living closed to whatever water, whether stream lake, river, reservoir, swamp or marches. Only two species living along the coastal areas. They are the marine otter and the sea otter. Apart from these two species their home and sleeping areas is usual dug into the banks and the entrance, for safety, are under water or exposed.

The sea otter does nothing but lives in the water. It sleeps in kelp beds. It wraps the strands of kelp around its body to make sure it doesn't get swept away. It not only sleeps there but mates and gives birth at sea as well as feeding in the water.
Usually, the otter hunts and feeds at night. If it knows that it won't get disturbed by human it does venture out during the day.
Their social lives differ from one group to the other. Most of the European otter are solitary animals. When they mate, they will spend quite some time together. The giant otter, the spot-necked otter and oriental short-clawed otter are living in small groups. All the other species are to be found either single, or in small group or in pairs.
Only a few otters have their own territories. They mark it with their glands which are under their tail or urine or faeces. The ones that live in groups have a communal toilet and they stamp their urine and faeces into the ground with their feet.
Otters are very vocal and they can produce a wide variety like chuckles, twitters, barks, chirps, grunts, purrs and growls. These sounds represent all sorts of messages. like greetings, summons, threats and alarms. They are from females to pups, between mating pairs and other otters in their territories or areas.
Otters look extremely playful when they slider around or roll over or dive in the water. However, scientists assume it could be meaningful purpose. like leaving scent marks or establishing social bonds or hunting techniques.

EURASIAN OTTER

They are extremely carnivorous and they eat what they can catch in the water world. It can fish of various sort, eels, crayfish, crabs, molluscs and frogs. Some, like the European otter and a few others, eat small water birds and mammals, like voles.
They all have that stiff whiskers around the snout which helps them to search underwater for prey. The method of catching their prey differs from species to species. They can grab fish with their paws or snap their prey with their strong jaws and teeth.

SEA OTTER

The sea otter is cute to watch when catching its prey and feeds. After diving to find some food like abaline, sea urchins, crabs, mussels and clams. It brings the catch to the surface plus a small stone. While floating on its back, it places the stone on its chest and hits it with its catch to crack it open.
They mostly bring their catch up to the surface and swim on their backs while eating. Some also bring it to the bank. They have a tremendous appetite and mostly to keep their energy up. During their waking hours they hunt and eat several times. River otters hunt in pairs and drive a school of fish into an inlet or corner where they can catch them easily.


NORTHERN RIVER OTTER
 

All otters can crash fish and hard shells of crustaceans with their strong teeth and swallow it.
The breeding season of otters varies. Some they have specific time, mostly in spring. Other they breed at any time during the year. Gestation can be from 60 to 80 days. Some otters have a delayed implantation of the fertilized egg into the female's uterus.
The number of young ones again varies. For instance, the cape clawless otter can have up to five young; the sea otter seldom has more than one. The pup is born with the eyes open and has teeth. 
The European otter gives birth to two or three pups in its underground den. They are blind, naked and are completely helpless for six weeks. They have their first swim after 72 days and will be weaned at two or three months. They stay in the family group until the female give birth again.
Most of them bring up their pups on their own. Only the male river otter stays with the female until she give birth then she turns him out. However, he returns when the pups are half grown and helps her.
Most otters are threatened or endangered species. Man is their greatest enemy. They get hunted for their beautiful fur and the fur of the sea otter is most valuable. They got hunted for sport. Also because of their ferocious appetite they get hunted because they reduce the number of fish in a river. Another problem is the pollution and many thousands of otter were poisoned recently. Also they get hit by motor cars.
All species are under protection but in remote areas it is hard to enforce. It also had been found that some species developed an immune system towards certain poison. On the other hand, species which where thought to have died out were sighted in some areas.






GIANT OTTER (Pteronura brasiliensis)
Overall length 140-180 cm -- Range: South America




SEA OTTER (Enhydra lutris)
Overall length: 68-163cm -- Range; Pacific coast from California to Alaska.




RIVER OTTER (Lutra canadensis)
Overall length: 95-150cm -- Range: Alaska, Canada and much of USA




EUROPEAN OTTER OR 
EURASIAN OTTER (Lutra lutra)
Overall length: 90-110cm -- Range: Europe to Indonesia, North Africa








SPOT-NECKED OTTER 

(Hydrictic maculicollis)
Overall length: 90-110cm -- Range: Patchy distribution in Africa south of Sahara.








ORIENTAL SHORT-CLAWED OTTER (Aonyx cinerea)
Overall length: 66-99cm -- Range: India and southern Asi

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