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.