Parrot, the beautiful song bird of nature

Parrot is the beautiful animal bird of nature. It is included under the class aves of phylum chordata. being the birds parrots show the general characters of birds  which are as follows:
1.They have the stream-lined body
2. Body is covered with feathers which provide the   good insulating mechanism to their body.Feathers help them to decrease the body weight as well.
3. Forelimbs are modified in the form of wings which help them to fly in air.
4. They have the hard and curved beak which are white or red in colour. Beak halps them to tear the nuts and hard fruits.
5. The colour of the body is very attractive with :amixture of green and lemon yellow which looks brilliant tot eh viewers.
6. Their tail is cylindrical and help them to balance the body in air during their flight.
Parrots as the beautiful cage bird: Parrot is the beautiful cage bird. It has the sweet voice and it can imitate certain words of human beings. So people use to keep them inside the cage and use to hear their sweet song time to time.
Role of parrot in ecosystem: Parrot is not only the beautiful animal of nature but also has the important role in balancing the natural system called ecosystem. Being the herbivorous bird, it is included under the primary consumer in the food chain of ecosystem. They help to balance the number of producers in an ecosystem which is their role of balancing the ecosystem. As a whole they are helping to protect the environment by balancing the ecological system.

The Dragon, a symbolic animal

Dragon is a fabulous, winged fire breathing monster which is scaly- armoured . Dragons are symbolic animals because they are represented in various paintings, weaving- works, sculptures and wood works.They are also represented on the sides of the temples. For example dragons are sculptures in the Kalmochan temple at the Bagmati river and the Akash Bhairabha temple which is situated in Indrachowk of Kathmandu city.Hindus and Buddhists believe that dragon is associated with water. They believe that water sprout is regarded as a dragon as it can never be seen fully because its head or its tail always remains invisible.It is also regarded that a dragon and the tiger are mutual enemies. Buddhists regard that if a tiger's bone is thrown into a dragon's well, the rain will intervene and a fight takes place between them.It is also a common belief about the dragon that if the dragon moves there is always rainfall.
                 Dragons are usually represented half feline , half reptilian  with dorsally situated spikes and pin wined wings. However some people believe dragons to be winged lions and not the dragons.So it can be said that dragons are the animal symbols which can not be described in any one form but they show the mixed characters of the different animals. They are master pieces of carefully related forms. Sometimes horns are also depicted and fire juts out of their mouths. Their wings are highly styled and neck is powerful and thick.
The body is very muscular with swelled up chest. The treatment of the muzzle is excellent. They look very terrible in  appearance. The pre -paws are pointed in front. Phallus is highly erected to depict its fierce attitude.The dragons are bulky with square  block -like heads. The monster is in a roaring condition and has a forward -striding attitude. Dragon's figures are commonly woven on the carpets  which are manufactured in Nepal.

The Dragon, a symbolic animal

Introduction of squirrel

Squirrel is natures one of the beautiful animal. It comes under the phylum chordata. It belongs to the class mammalia. Squirrel as in the figure, shows the elongated cylicdrical bodywhich is covered with hairs. Its body

consists of the following parts:
a. head b.Neck.c. Trunk and d. Tail.
Head consists of the paired eyes , a pair of pinna or external ear, and a snout which is protruded anteriorly. At the tip of the snout , there is the mouth.
Neck: It is the second part of the body of squirrel and it lies in between the head and the trunk.
Trunk: Trunk is the third part of the body of squirrel. It lies just posterior to the neck and anterior to the tail. Trunk is the longest part of the body of squirrel and it is comparatively the wider part also. On the ventral side of the trunk two pairs of limbs are found, they are fore limbs which are anteriorely located paired limbs and the next pair of limbs are the hind- limbs which are longer than the fore- limbs.d.
dTail; It is the last part of the body. It is not very long but short and bushy.
Whole the body is covered with hair which is one of the important character of the class mammalia.
      Squirrels have the alternating longitudinal stripes of alternating black and brown colour on the dorsal side of its body which is the identifying feature. They are herbivorous animals and have the strong grasping power. They climb on the trees and can leap very fast to the long distance.
Distribution: It is distributed in the most ofthe tropical countries of South Asia like Nepal, India, Bangladesh etc.

Swan, the semiaquatic animal of nature.

Swan is also known as Hamsa. It is the long -necked bird with a red beak and a snow-white body. It is capable to fly high. It belongs to the migratory kind of bird. Its famous living place is Manosarobar , a famous big fresh water lake located in Tibet. This lake is the most sacred lake by both the Hindus and Buddhists and is situated against then backdrop of famous Kailash mountain.
According to Buddhists, in one of his previous birth, Buddha was a golden goose i.e. a kind of Swan He was helping a Brahmin  and his family by providing a feather daily. but the Gee Brahmin one day took off all the feathers which turned white and were of no value.
According to Hindus , Swan is the vehicle of Lord Brahma. Some scientists also consider the bird as the incarnation of Kubera, the Lord of wealth. Bannerjee write that later on the Hansa became the vehicle of Goddess Saraswati.Saraswati is the Goddess of learning.
 Anyway the appearance of a white Hansa or evena white bird over the head is considered to be an auspicious sign. When Budha got enlightenment, white birds similar to Hansa flew over him. Similarly when he descended fromTushita heaven or when he crossed the Niranjan river , white birds flew over the head of Buddha.

How do animals remove their excretory wastes?

Animals perform the different systems from the from the different organs. Excretory system which is found in animals as one of the vital systems of the body is the system which helps animals to remove the excretory waste ,materials from their body to out side. The organs which help in excretion are known as the excretory organs.The main excretory organs of the vertebrates are known as kidneys. Kidneys are paired structures which are bean-shaped and located in the dorsal wall of the abdominal cavity. Human kidneys are not located in the same level, one is located a little bit above than the other. Anyway kidneys are the very important organs of the animals body. They have two important functions:
One is the filtration of blood and the other is urine formation. For that purpose each kidney has its two important functioning parts: The Bowman's capsule- which helps to filter the blood and pass the useful substances present in the blood back to the body cells and the other important functioning part of the kidney is called the uriniferous tubule. It is the elongated tubule of varying diameter which helps to form urine.

Facts about Sharks

Introduction : Sharks are the animals which are included under the phylum chordata and the group vertebrata. They are in the series pisces. i. e. fishes.
Sharks do not have the well -developed skeleton like other fishes becaus  other fishes have the well developed skeleton which are made up of bones. But in sharks, the body is supported by cartilaginous skeleton that means  the skeleton is not made up of bones but of cartilage. Cartilage is not as hard as the bone and it is made up of the material called chondrin. That is the reason the sharks are also known as the cartilaginous fish.Sharks have the muscle tissue made up of cartilage and it makes the fish to be weightless in water.They are adapted excellently to live in water. They have the rough type of skin which is covered with the small toothed scales, which overlap like roof tiles to achieve streamlining and speed in water. Sharks can find their prey over distances of up to 1000 metres. They have ultra sensitive receptors in their snout and lateral sensorial system which detect the slightest vibration in water.They also have the reflective mechanism in their eyes which allows them to distinguish objects in dim light.