Indian
TigerTiger
in India Appearance and Physical CharacteristicsThough
slim and elegant, tigers are immensely powerful. Their front legs and paws
are tremendously strong: they can kill young elephants and rhino and drag
prey weighing 200 kg. (5001 bs.) Or more. Tigers walk on the fore pads of
their feet, which gives their stride suppleness and elasticity. They have
flexible forelegs that can twist inwards, allowing them to grasp prey. Their
claws remain retracted until they are needed in the final moments of attack.
Sight
and SmellTigers are famed for their glowing amber eyes. Unlike most
other cats, they have round pupils. Tigers have acute eyesight and the cells
in their eyes are sensitive to color. They can perceive depth because their
eyes face forwards, thus allowing direction and distance to be judged with
extreme accuracy. Tigers, like all cats, have a special adaptation that
gives them excellent night vision: a membrane at the back of the eye
reflects light through the light sensitive cells of the retina. This
effectively doubles the intensity of dim light. The same principal is used
in the "cats' eyes" on our roads.
Scent forms the basis
for territorial behavior. Tigers keep track of each other's movements by
scent marking, which helps them to avoid conflict. To make the best use of
information contained in a scent mark, the tiger has to hang out its tongue
and draw back the lips, causing the eyes to close. This is called the
flehmen response and it allows the tiger to pass the scent through two small
holes in the upper palate behind the incisors in effect the tiger can "test"
he scent. To human eyes, the expression looks like a grimace of disgust.
HabitatTigers
inhabit many types of forests, from the mangrove swamps of Bangladesh to the
coniferous forests of the Russian Far East. Dense vegetation, plenty of pre
and minimum human interference are all requirements of good tiger habitat,
as are pools for drinking and bathing. Tigers of the warmer climes love
water and may even sleep with part of their body submerged. They are adept
swimmers. Young tigers are agile enough to climb into trees but adults are
generally too heavy. However, an angry tiger in Siberia was reported to have
limbed into a tree in an attempt to swat the helicopter that was following
it
PredationTigers can kill prey that exceeds their
own weight. A tiger can eat over 30 kgs (66lvbs ) of meat in a single night,
though a large kill ma be needed only once or twice a week. In the meantime,
snacks such a peacocks, crabs turtles, fish, lizards, small birds or even
locusts will suffice. Tigers are not exclusively carnivorous and will
sometimes eat jungle fruits. Their stomachs often contain earth, and his is
probably ingested to aid digestion.
In India, hog deer, chital
(spotted deer), barking deer, sambar, nilgai and wild boar are the favorite
prey, though tigers will also kill jungle ox and even young elephants and
rhino of up to 450 kgs (1000 lbs ) in weight. Tigers will seek to
porcupines, even though these prickly creatures have a nasty habit of
backing into a pursuer in order to drive in their spines. Injuries form
porcupines may fester and can even cause the death of a tiger.
Tigers
tend to hunt between dusk and dawn. They are less active during the day and
may lie satiated in the shade or in a pool near the remains of a kill.
Tigers often cover an unfinished meal with soil and leaves and return to it
later. Even so, scavengers are quick to take advantage, though they risk
annoying the owner of the kill. A tiger was photographed pouncing on a
vulture in sheer exasperation and an irritable tiger will even chase away
crows.
Sight and sound, rather than scent, are used to locate prey.
Tigers are too large and too heavy to run for long distances and therefore
must patiently stalk their prey until they are close enough to make a final
lunge for the neck. Effective camouflage is essential and in patches of
sunshine and shade a motionless tiger is practically invisible. Despite
being one of the most feared of the world's predators, tigers are often
unsuccessful in catching their prey. Prey species have acute hearing and
many run faster than a tiger. Some have alarm calls that warn all the
animals in the vicinity to be wary. If the tiger fails in a hunting attempt
it must move to another area or wait until the forest becomes calm again.
It
is interesting to compare this technique with those used in more open
habitats where there is not enough cover to conceal a stalking predator. In
the African Savannahs, for example, cheetahs have developed unsurpassed
speed and prides of lions have learnt to hunt cooperatively. The remains of
a kill are also more difficult to conceal, and any left uneaten will be
quickly finished off by scavengers. Cooperative hunters therefore share the
kill amongst themselves, so that nothing is wasted on those animals who are
looking for a free lunch. The development of different hunting strategies to
suit habitat types is part of a process known as optimization.
Tiger
behavior is flexible and the choice of prey, as well as the technique for
catching in, will be influenced by how plentiful the prey is and how easily
it is caught. Tigers in areas where the vegetation is less dense are more
likely to hunt large prey cooperatively and to share their kill. This was
the case in Ranthambore National Park during the 1980s. Up to nine tigers
were seen lying together in a social group, just like a pride of lions.
Tiger were observed sharing their prey not only with their young, but also
with other adults. Rather than a strict hierarchy, it seems that the titer
that makes the kill always gets the first meal, even if the other tigers
present are larger.
Tiger CubsTiger cubs are born
blind and helpless, weighing only 1.5 kg (3/3lbs). The cubs' eyes open after
one or tow weeks. Initially blue of blue green, the eyes will darken later
to glowing amber.
On average, there are three cubs in a litter,
though an exceptional seven was once recorded.
Tigresses are
devoted mothers and when the cubs are young, she will move them to places of
safety, carrying them gently one by one in her huge, powerful jaws. Cubs are
very vulnerable to attack by passing predators and many perish before their
first year is out. Jackals, hyenas, leopards and pythons, as well as other
tigers, are all a potential threat. The tigress must choose a carefully
hidden den and leave the cubs alone for as short a time as possible while
she hunts. Grass fires, which are often started deliberately to improve
grazing, kill many tiger cubs.
The cub remains in the den for four
to eight weeks. They then venture into the outside world for the first time
and receive their first taste of meat. They keep in single file behind the
tigress, and it is thought that her striped tail and the large white spots
behind her ears act as beacons for the cubs to follow. The runt of the
litter, if it has survived to emerge from the den, is always the last in the
line of cubs and is often picked off by predators.
It is extremely
rate that more than two cubs in a litter survive to maturity. Having said
this, it is possible that the survival rate would be much giver given
sufficient pry density. In the mid 1980's prey density in the Ranthambore
National Park was so high that four cubs in the little survived to maturity
in at least three cases.
The ratio of male to female cubs born is
about one to one, but more females survive into adulthood because the male
cubs leave the family earlier and are more likely to perish because of their
inexperience at hunting. Males can also suffer injuries in territorial
disputes and may be more vulnerable to huntress, as they are less wary of
baits.
In contrast with the careful nurturing received by wild
tigers, cubs born in captivity are usually abandoned or eaten if not
immediately removed by zoo keepers . Presumably the unnatural conditions are
the root cause of this aberrant behavior.
Growing Up Tiger
cubs are playful and their games together games together begin to teach them
the skills necessary for survival. They stalk and pounce on leaves, insects,
or even their mother's tail.
At first, the cubs must hide in the
undergrowth while the tigress hunts, but later they are allowed to watch and
eventually join in. the young cash help the tigress by driving the chosen
victim towards her. Learning to hunt is a difficult and dangerous process
and many cubs are gored of trampled to death. Inexperienced cubs tend to
grab the legs of the prey, leaving them vulnerable to retaliation. Sometimes
the tigress will intervene. She can bring down the prey and then leave it
for the cubs to kill. It takes many attempts before he cubs learn to kill
efficiently by biting the throat or the nape of the neck.
A mother
tiger may allow her cubs to feed first . If she joins her young at a meal,
she will withdraw if a cub protests and will go without meat to ensure that
they have enough. The cubs have voracious appetites and by the time they are
14 months old , it is a strain for the tigress to capture enough prey. The
runt is the last in queue at meals and if food is in scarce supply, it will
starve to death.
Their lessons learned , young tigers must venture
out in search of a territory. Male tigers leave their mothers at about 18-22
months old. Sub-adult males are often tolerated by other males, but this
will change on reaching maturity. Each young male must then look for a
vacant territory, or one where there is a chance of ousting an old or sick
male. Females remain with their mothers for 24 to 28 months and will help in
the capture of prey until they leave. When the tigress is ready to mate
again, she might become aggressive towards her daughters. One daughter may
be allowed to settle inside the mother's territory, but the rest must find
space in the territories of neighboring males. Newly independent tigers lack
haunting experience and a second's hesitation may leave them to go hungry.
The
young tigers will become sexually mature at three to four years old and by
this time are ready to found the next generation of cubs.
:: Spotting
Tigers ::