Whales and dolphins are the aquatic animals. They are distributed in the aquatic habitat. Whale is the perfectly marine in habitat where as the dolphin is also found in fresh water as well as in marine habitat.  Both whales and dolphins have got stream-lined body with the paddles and flippers as the locomotary organs. They are excellent divers in the aquatic habitat. Whale is the largest animal of nature. But Dolphin is considered to be the intelligent mammal.They show the secondary aquatic adaptation i.e. they were primarily adapted in the terrestrial habitat but in the course of evolution they migrated from the terrestrial habitat to the aquatic habitat and started tom live permanently in the aquatic habitat.

Animals of spiritual value

Animals are valuable from the different point of view. Some animals of nature are of high spiritual value. There are many animals which are considered to be spiritually valuable  and even worshipped from time to time in the special occasion. Some of such animals are elephants, tiger, lion, Garuda, fish, snake, mouse etc.
 Elephant which is the very big animal which is spiritually valuable. It is considered to be the incarnation of Lord Ganesh. Its trunk is comparable to the trunk of Lord Ganesh. It has been the belief that if the soil inside the feet of elephant is touche dor kept in home it will do good harmony in the home. It is the good sign which helps to eliminate evils around the home.
Another important animal of spiritual value is the tiger which is considered to be the bahan of Goddess Durga. She had won the victory over Demon Madhukaitab by riding over the tiger and fighting with the fearful monster. Similarly, snake has its own value in spiritual world. Although snakes are fearful animals of natureand have frighetening appearance, snakes are considered to be the incarnation of God and worshipped as Nagraj, i.e. the king of snakes They are worshipped on the occassion of Nagpanchami.

Octopus, the well known predicting animal of nature.

Octopus, is the common marine animal which comes under the phylum mollusca and class cephalopoda. It is the very popular animal in forecasting and predicting the future events. The general characters of this animals are the following:
It has the soft body which consists of the skeleton which is made up of calcium carbonate. Its locomotary organs are situated in the head region, It has the sucking organs in its body. What is particular about octopus? One of the peculiar of octopus is the capacity of this animal to predict the future events. For example, Octopus paul was the very popular octopus which was born in England and brought to Germany. It was kept in the tank and given the mussel as the food. Then the flags of the concerning countries were placed in the tank. Then, the observation was done by looking the choice of octopus Paul to choose the box with flag of the concerning country. The Octopus Paul's prediction became correct as its choice for Spain's flag as the future winner was materialized. Then it was found to be dead in the month of October in the same year.

Hippocampus, a peculiar bony fish of sea

Hippocampus  is the peculiar bony fish of marine habitat. It is quite different from the other remaining bony fishes. Being a bony fish it exhibits all the general characters of the other bony fishes such as presence of body covering with smooth cycloid and ctenoid scales, having a gill covering called operculum, and the skeleton whichnis made up of true bone instead of cartilage. The particular characters which make it quite different from the remaining other bony fishes are that it is the fish which is more or less similar to the horse. Its snout is very much similar  to the appearance of a horse. and it always lives in the sea. So it is known as sea horse. The other peculiar character of this fish is the swimming method of this fish. It has the capacity to swim vertically. i.e. up and down. Other bony fishes use to swim horizontally but this fish  swims vertically , up and downward movement. Another important character of sea horse is that it is adapted to hold the twigs  and so it is adapted to resemble with the twigs of the branches of the tree. Its tail is prehensile. So, it has become the peculiar fish of marine habitat.

Butterfly, the beautiful animal of nature

Butterfly is the well-known invertebrate of animal kingdom. It belongs to the class insecta of the phylum arthropoda. Being the representative animal of phylum arthropoda, it exhibits all the general characters of phylum arthropoda like body covering with the exoskeleton of chitin, jointed appendages in the body, distribution in the air and other terrestrial habitat but wide capacity of tolerance to survive even in the cold climate of the peak of the mountains. Butterflies are of different colors and they use to live in the gardens especially during the day times.
  Their body can be divided into the three parts: they are anterior head, middle thorax and the posterior abdomen. Head consists of a pair of compund eyes, a pair of clavate antennae and mouth parts. They have the siphoning type of mouth parts which is adapted for sucking up the nectars of flowers. This type of mouth part consists of a well-developed proboscis which is used to form a sucking tube for collecting nectar of flowers. They have one pair of wings which lie vertical in position when they are at the resting stage.They remain active during the day time. Such animals are called diurnal animals.

Amphibians of Nepal

Amphibians of Nepal are of various types. There are 43 species of amphibians reported from Nepal according to (Shaha,1995) and Tiwari (2004).Shaha and Tiwari reported 53 species of amphibians from Nepal in "Herpeto fauna of Nepal: A conservation companion". They are of considerable aesthetic and economic importance. Some of them are found in great abundance in the remote hills and plains of Nepal. Some formerly common have become increasingly rare due to habitat destruction, pollution of the streams, lakes etc where they live. In the villages , the frogs are extensively hunted for commercial purposes. Some tree frogs are caught and kept in earthen  pots and marketed in the living form.The killed frogs are dried or smoked and are sold in the off season.
 Purplw Caecilian (Ichthyophis glutinosa) is a burrowing amphibian reported from the locality of Butwal  area. It is the only representative genus and species from the order Apoda.
 Himalayan newt or salamander (Tylototrion verrucosus)  commonly called pani kukur is the only urodel found in Arun valley of Nepal.

Giardia, the endoparasite

Giardia is one of the endoparasite which lives inside the alimentary canal of men and other vertebrates. This is the unicellular protozoan which comes under the class ciliata. Giardia lambla or Giardia intestinalis is a parasite in the small intestine and colon of men. It remains attached in masses to the mucus membrane from where it absorbs food consisting mainly of mucus.Occasionally the parsite invades the bile ducts and gall bladder.Other species of Giardia are parasites in the intestine of vertebrates.
Giardia has an elliptical body which is bilaterally symmetrical. The dorsal side is convex, but the ventral side is flat or may be convex.. The anterior end is rounded and the posterior end is tapering.In the anterior half of the ventral surface is a concave sucking disc for attachment to the host.There are two vesicular nuclei and four pairs of long flagella.Passing through teh cytoplasm from the anterior to the posterior end are two parallel ,flexible, needle like axostyleswhich support the body. The nuclei are attached by fibrils to the axostyles. Just behind he sucking discs is a deep staining parabasal body.
   Giardia prevents absorption of fats by the host inside the body of which it lives. The unabsorbed fat causes diarrhoea.It also forms oval thick-walled cysts. Cyst undergoes the division of nuclei inside it as a result of which four nuclei  are formed. The cysts pass out with the faeces and remain infective for about ten daysor more. The parasites can be removed by the treatment of the disease by the help of antimalarial drugs like chloroquin ans antrebrin.