The origin of animals Animals are one of the basic branches of organisms grouped together
in a kingdom called Animalia,
They are all characterized by multicellularity and eukaryotes of different shapes and sizes, and it is not possible to determine when the animals began to appear in time,
But its appearance is estimated to be at least a million years old.
The origin of the animals is multicellular mollusks, and both existing and extinct animals are now classified into about (30-35) different people.
[1] Animals with the same characteristics are grouped into specific classes, and the classification of animals includes the following:
the rarage
kingdom.
division sects
. rank
. Second Level.
family
. sex
. He writes.
Types of animals Animals are divided into the following categories: [3]
Invertebrates: The most important feature that distinguishes them is the absence of invertebrates, including: worm, octopuses, and insects. Fish: The oldest group of vertebrates, divided into: larg fish, cartilaginous fish, and jawless fish. Amphibians are distinguished by the way they live on land and in water, and are divided into two types: legless and legless. Reptiles: Many species originate from reptiles, the most important of which are: crocodiles, snakes and lizards, as well as turtles, which are cold-blooded. Birds: Birds are a group of animals that are all characterized by feathers that cover them and are warm-blooded. Mammals: These are the most highly evolved and least diverse of the warm-blooded animals.
Animal feeding Animals feed differently, here animals are classified according to food: only parts of plants; Like seeds and fruits, these animals have incisors at the front of their jaws that help improve their ability to pick up and cut food, in addition to having premolars to grind food, and most of these animals are large in size, and they spend most of the day eating to provide themselves with sufficient energy, for example: [4 ]
cows.
Vertigo
. stag.
Carnivores: carnivores that feed on other animals, whether they are herbivores or carnivores, and vary in size and are characterized by sharp teeth and strong jaws, most of which have prominent fangs; tearing apart its prey, an example being:
[5] The lion. This wolf. falcon. frog. Carnivores are characterized by a diet that combines plants and animals, and this diversity follows the nature of the available food, so they prey on other animals, whether they are herbivores or carnivores, and feed on fruits and vegetables, but the digestive system cannot digest some species. From food plants, for example, such as grains and herbs, the teeth of omnivorous animals help to tear and grind food at the same time, because their teeth are sharp in addition to the flat molars,
[5] Examples include:
[4]
bears.
ground squirrel
. raccoon.
Animal senses Some animals have supernatural senses that exceed human capabilities and help them live in a way that suits their environment, including: [6] Birds of prey have; Like eagles, they have extraordinary vision that helps them see for miles out in detail. Dogs have an extraordinary sense of smell, which allows them to recognize odors from a great distance. Insect antennae are multisensory, with which they can smell, taste, touch, and hear. The bee can see ultraviolet light, which helps it track which flowers its petals reflect this radiation. The fish have only rods, no cones, and are colourless, as expected. All types of cats never distinguish between sweetness. Dogs do not distinguish between green and red, which is called color blindness. Chicken eyes are sensitive to flashes of light.
The way animals coexist with each other in nature, animals use different methods for coexistence, which is the way animals adapt to each other, through the establishment of symbiotic relationships in which two species exchange their interests, so each party fulfills a specific benefit, and examples of this are (7) the relationship between buffalo and heron, whereby the heron feeds on insects Harmful substances found on the body of the buffalo, and the buffalo should clean its body. The relationship between zebras and ostriches is based on symbiosis to take advantage of the donkey's sharp eyesight and the ostrich's wonderful sense of smell, and thus their survival together contributes to increasing security for alertness.
the presence of predators. The relationship between the Egyptian crocodile and the plover These two animals embody a strange friendship, as the plover cleans the crocodile's teeth and gets his meal from them. Communication between animals and their language Animals communicate to express their feelings among themselves and can communicate information to members of their sex if they want to, but they do not have a language like human languages, (8) and among the methods of their communication are the following (9) Visual communication Animals visual communication is divided into two types; Shows and signals, for example, the dog raised its tail to express its happiness, and the male yellow goldfinch, which boasts of its feathers to attract females.
Auditory communication Animals make a variety of sounds to express something; Like joy, calling friends, pain, and threats, the barking of dogs indicates the threat of strangers, and dolphins express themselves to others by issuing sounds. Chemical communication Chemical communication expresses a method used by some species of animals to communicate, which is to leave chemical signs; Like smells, and these smells act as a threat or attraction to mating, and from that, the behavior of a skunk when it feels afraid. Tactile communication Animals touch in attempts to prove affection, or sometimes show control, and examples of this are; Cats touching their babies, and some animals brushing for their family members.
Animal behavior Among the behaviors of animals is predation. Animals are divided into pets and predatory animals that attack others. Predation is one of the behaviors familiar to animals. Some animals feed
By hunting individuals or groups, and enjoying senses that help them to do so; Such as strong hearing and sharp vision. (10) Mating This behavior includes attraction at the beginning, and is followed by courtship and sexual intercourse.
Also, some animal parents feel paternalism towards their children, so they enjoy their care for a period. (11) Coexistence Animals form symbiotic friendships among themselves that guarantee the fulfillment of their interests through them, so both sides of the relationship benefit in some way. (7) Animals are multicellular eukaryotic organisms, It has many types and specific classifications, and it has many senses that help it live, as well
They differ among themselves in their feeding methods; Some of them are carnivores and some are herbivores, and some of them feed on both types. Animals also differ in their ways of adapting to the surrounding conditions and coexisting with other animals. In addition, animals are organisms that interact with each other and with others through a number of methods of communication, but they do not have a special language. .