Rats SVG are mammalian animals, rodent squads, mice.
Rats SVG are considered to be one of the most common animals on the planet, and the fossil remains of the very first rats have lain in the ground for several million years.
Rats have a characteristic oval torso shape and a stocky body of most rodents. The body length of the adult rat is 8 to 30 cm (depending on the species), the weight of the rat varies from 37 g to 420 g (individual gray rats can weigh up to 500 grams).
Rat’s face is elongated and pointed, eyes and ears are small. The tail of most species is almost naked, covered with rare woolen wool and ring flakes. The tail of a black rat is covered in thick wool. Most species have tail lengths equal to or greater than body size (but there are also short-tailed rats).
Rodent jaws contain 2 pairs of elongated incisors each. The rat’s root teeth grow in dense rows and are intended for shredding food. Between the incisors and the molars there is a diastema, a part of the jaw on which the teeth do not grow. Despite the fact that rats are omnivorous, they are distinguished from predators by the absence of fangs. Animals’ incisors require constant grinding, otherwise the Rat SVG simply cannot shut his mouth. This feature is due to the absence of roots and the continuous growth of incisors throughout the life of the animal. The cutters are covered with hard enamel in front of the cutters, but there is no enamel layer at the back, so the surface of the cutters becomes uneven and gets a characteristic shape resembling a chisel. The teeth of rats are extremely strong and can easily gnaw at bricks, concrete, hard metals and alloys, although they were originally designed by nature to eat plant foods.
The rat’s hair is dense, relatively thick, with pronounced spindle hair. The fur of a rat can be dark grey, gray-brown, with reddish, orange and yellow hues in some individuals.
Rats have poorly developed foot calluses, which are necessary for rodents to climb, but the functional defect is compensated by moving fingers. Therefore, rats are able to lead not only a terrestrial but also a semi-tree way of life, climbing trees and building nests in abandoned hollows.
Rats are very mobile and enduring animals, they run well: in case of danger, the animal can reach a speed of up to 10 km/h, overcoming obstacles up to 1 meter high. The rat’s daily diet is from 8 to 17 km.
Rats swim and dive well, fish and can stay in the water for more than 3 days without compromising their health.
Rats have poor vision and a small viewing angle (only 16 degrees), which forces the animals to turn their heads constantly. Rodents around the world are perceived in gray tones, and the red color is a continuous darkness for them.
Hearing and sense of smell function well: rats hear sounds at frequencies up to 40 kHz (in comparison: people up to 20 kHz) and smells are picked up at short distances. On the other hand, rats can tolerate radiation exposure (up to 300 x-rays per hour).
The life expectancy of a rat on the outside depends on the species: grey rats live about 1.5 years, rare specimens can live up to 3 years, black rats live no more than a year. Rodent life is doubled in laboratory conditions. According to the Guinness Book of Records, the oldest rat at the time of death was 7 years and 8 months old.