The word is zoology, and this area of science covers the study of all things in the animal kingdom.
A whopping one million species have been identified -- and don't forget, we're referring to generic species, not animals within sub-species.
Fossil evidence indicates this.
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The fifth one is fungi. These five kingdoms cover all types of living organisms.
Each kingdom is distinguishable by the traits of those within its classification, but some organisms possess traits from more than one kind.
It has to be able to move about under its own power (be mobile) during a stage of its life, unlike plants and fungi.
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Many bodily systems are present in all members of the animal kingdom. Those NOT mentioned yet include: integumentary, immune, excretory, endocrine, nervous and reproductory systems.
They're called primates. This group includes apes, monkeys and lemurs.
All animals possess adaptations. Each animal has its own adaptation in the form of camouflage, size, body shape or whatever, that protects it from predators.
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This phenomenon is particular to warm-blooded creatures and it's called hibernating. They can do this because of their ability to adapt to environmental change.
They will migrate as far as 11,000 miles (18,000 kms) to find warmer waters for breeding.
Bears and bats both instinctively choose this form of shelter for sleeping and raising young.
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Some animals, such as birds and bees, carry pollen from flower to flower and this facilitates fertilization. Other animals spread seeds around by carrying them on their bodies or in their fur.
Termites and ants have a discernible system of hierarchy. In this system, each caste has its own body structure and performs its own tasks.
Commensalism. A good example of this is barnacles that live on the backs of whales at no expense or harm to the whales themselves.
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Ethology is the study of animal behavior.
In most cases, the animal will not be tempted to eat because it is satiated already. This is part of its instinctive food drive -- the drive to eat until satiation.
The senses of sight (vision), smell (scent) and sound (hearing) are all used for communication between animals.
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In certain ancient societies, animals were worshipped as gods. An example of this is ancient Egypt, which worshipped the cat and the lamb.