Bright fish swim in the aquarium

Animals are multicellular, eukaryotic organisms, with many types and specific classifications, and they have many senses that help them to live, and they differ among themselves in the ways of feeding them; Some of them are carnivores, including herbivores, and some of them feed on the two species. Animals also differ in ways of adapting to the surrounding conditions and coexisting with other animals. In addition, animals are creatures that interact with each other and with others through a number of ways of communication, but they do not have a special language
The origin of animals Animals are one of the basic sections of living organisms, and they are collected in one boring called (Animalia), and all of them are characterized by being multicellular and eukaryotes of different shapes and sizes, and it is not possible to determine the time point at which the animals appeared, but their appearance is estimated It is less than millions of years old, and it is believed that the origin of animals is multicellular mollusks, and existing and extinct animals are currently classified into about (30-35) different phyla.[1] Animals that share the same traits are classified into specific classes, and the classification of animals includes the following: [2] Scope. The kingdom. Division. sect. Rank. secondary rank. the family. sex. Type. Types of animals Animals are divided into the following types: [3] Invertebrates: The most important thing that distinguishes them is that they do not have a backbone, among them: worms, octopuses, and insects. Fish: The oldest types of vertebrate animals, and are divided into: great fish, cartilaginous fish, and jawless fish. Amphibians: are distinguished by their lifestyle between land and water, and are divided into two types: legless and legless. Reptiles: A number of species descend from reptiles, the most important of which are: crocodiles, snakes and lizards, in addition to turtles, all of which are cold-blooded. Birds: Birds are among the many types of animals, all of which are distinguished by the feathers that cover them, and they are warm-blooded. Mammals: They are the most evolved, least diverse, and warm-blooded animals. Animal nutrition Animals differ in the way they are fed, and the following is the classification of animals according to food: Herbivores Herbivores feed on plants only, and their digestive tract is qualified to digest different types of plants, but some herbivores focus on a specific part of the plant only; Such as seeds and fruits, and these animals have incisors in the front part of the jaw that contribute to increasing their ability to pick up and cut their food, in addition to owning the front molars to grind food, and most of these animals are large in size, and they eat during most of the day to provide themselves with sufficient energy, and examples: [4] ] Cow. Spinner. stag. Carnivores: Carnivores feed on other animals, whether herbivores or carnivores, and their sizes vary between small and large, and they are characterized by having sharp teeth and a strong jaw, and most of them have prominent fangs; To tear apart its prey, for example: [5] the lion. the wolf. hawk the Frog. Omnivores are distinguished by their diet that combines plants and animals, and this diversity follows the nature of the food available. They hunt other animals, whether herbivores or carnivores, and feed on fruits and vegetables, but their digestive system does not enable them to digest some types of plants; Such as grains and herbs, for example, and the teeth of rats help in tearing and grinding food at the same time. They have sharp teeth along with flat molars,[5] such as:[4] the bear. Ground squirrel. raccoon; Senses in Animals Some animals have supernatural senses that exceed the capabilities of humans, and these senses help them to live in a manner appropriate to their environment, including:[6] Birds of prey enjoy; Like eagles, they have an incredible sense of sight that helps them see details from miles away. Dogs have an unusual sense of smell, which enables them to recognize distant odors. Antlers for insects are multi-sensory, through which they can smell, taste, touch, and hear. Bees can see ultraviolet rays, and this helps them track flowers whose petals are reflecting this type of rays. The eyes of fish have only rods, and they lack cones, and thus their inability to see colors can be predicted. Cats of all kinds never discriminate in sweet taste. Dogs do not distinguish between green and red, and this is called color blindness. The hen has eyes that are sensitive to flashes of light. The way animals coexist with each other in nature Animals use different methods of coexistence, which is the way animals adapt to each other, through the establishment of symbiotic relationships in which two species exchange their interests and each party meets a certain benefit, for example: [7] The relationship between buffalo and heron: the egret feeds On the harmful insects found on the body of the buffalo, and the buffalo enjoys cleaning its body. The relationship between zebras and ostriches: It is based on symbiosis to take advantage of the donkey's keen eyesight and the wonderful sense of smell of the ostrich, and thus their stay together contributes to increasing the safety of alerting to the presence of predators. The relationship between the Egyptian crocodile and the plover: These two animals embody a strange friendship, as the plover works to clean the crocodile's teeth and get 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 species if they want to, but they do not have a language like human languages,[8] and the ways of their communication are as follows: [9] Visual communication: Visual communication in animals is divided into two types; Shows and signals, for example, the dog raising its tail to express its happiness, and the yellow goldfinch, which flaunts its feathers to attract females. Auditory Communication: Animals make a variety of sounds to express something; Like joy, calling friends, pain, and threats, dogs barking indicates a threat to strangers, and dolphins express themselves to others by making sounds. Chemical communication: Chemical communication is a method used by some species of animals to communicate, which is to leave chemical marks; Like odors, these odors act as a threat or attraction to mating, including the behavior of skunks when they feel afraid. Tactile communication: Animals touch in attempts to demonstrate affection, or sometimes to show control, for example; Cats touching their children, and cleaning some animals for his family members
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