The dog originated from the wolf
The dog is descended from a wolf. The modern dog is the ancestor of the oldest pet. She was domesticated in various parts of the globe. This led to the fact that at present the number and variety of behavioral traits in dogs far exceeds other species. In some breeds, watchdogs and hunting were determined; in others, game, artistic, and so on, variants of behavior that corresponded to different uses of dogs and were fixed by selection in a succession of generations. In the phylogeny, an intrabreed and pedigree variety of behavioral traits has developed. Accordingly, the structure and function of analyzers and their efferent apparatuses have improved more than wild relatives. The sensory systems of dogs were improved on the basis of genes and, thus, animals were spread with “perfect” behavior. This applies primarily to the olfactory analyzer of dogs. The acuteness of the sense of smell in dogs is much higher than in humans, and the types of behavior associated with this are also extremely high.They are preserved thanks to the phylogenesis of domesticated animals.
Dogs do not equally distinguish four main varieties of taste: sweet, bitter, salty, sour, and most of its combinatorial. Dogs are characterized by large limits of hearing diversity. These and other criteria prove the corresponding diversity of behavior. The nature of the latter, as you can see, is very complex. Perhaps it is associated with a quantitative variety of parameters of the brain. The size and weight of it in dogs varies more than that of wild predators. For example, the brain of a fox terrier weighs 32 grams, and the brain of a leonberger is 150 g. During the first year of life, the dog's brain reaches its maximum weight. The ratio of brain weight and body weight is also not infinite. For small dogs, it is 1: 37; at large - 1: 110. The average length of the brain is 80 mm, the hemispheres 71 mm, the length of the protruding part of the olfactory bulbs is 3 mm and the protruding part of the cerebellum is 9 mm and, possibly, hides the unexplained causes of the various behavior of dogs. In this connection, it seems reasonable to point out the need to study the genetics of the development of the nuclei of the cerebellar nerves of the rhomboid brain, the thin and wedge-shaped fascicles and the medial loop, the anatomy of the cerebellum,the optic lobes of the cranial body of the brain, the subcortical center of hearing, the visual hillocks and the cortex of the end-brain hemispheres.
They are manifested in the form of pleasure and displeasure, courage and fear, delight, joy and sorrow, friendliness, love and dislike, fear, humility and disobedience, jealousy and indifference, caress, anger, anger and other feelings.
Analyzing the behavioral reactions in dogs, we can characterize them as cowardly, easily fearful, sharply excited, which accompanies crying, other individuals — bold, active, aggressive. When the emotions develop in dogs, the position of the head, neck, ears, tail, skin changes, groaning, whining, screaming, yelping, barking. Dogs can bite, stagnate, jump, run, etc. The dog has a sense of joy. Especially often this can be observed in puppies and young animals. A dog that caresses for the owner can crawl on the ground, wriggling with his whole body, wagging his tail, pressing his ears. Lips are drooping, eyes glisten with excitement. If she is cheerful, happy, joyful, then runs ahead of the owner trot, usually holding the tail up, but not as tense as when anger and anger.So, the dog originated from the wolf.
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