Characteristics of teeth in insectivores

Insectivores have small, sharp canine teeth and sharp molars.

Rodents have various rodents, squirrels, hamsters, etc.

Rodents generally refer to rodents. An order of mammals, namely mammals, rodents. Rodents mainly include: various rodents, squirrels, hamsters, bamboo rats, beavers, jerboas, dormice, guinea pigs, and porcupines.

Rodents have a long history of evolution, evolved to perfection, and have become extremely diverse in morphology and vary greatly in size. Most species are between 10 and 20 cm in length and weigh less than 100 g. The rodent series is super capable, with a few species breeding only one litter each spring, and most of them giving birth to about three litters in spring, summer and autumn.

The litter size varies from 4 to 6 in most cases, to 7 8 in many cases, and up to 18 in litters.

Features:

The most prominent feature of rodents is that the upper and lower jaws have only one pair of incisors, and the female has a bicornuate uterus. There are 29 families, 380 genera, and 1687 species of rodents in the world, accounting for about 40% and 50% of mammals, which is the order with the largest number of species in mammals.

Rodents each have a pair of chiseled incisors with enamel on the front edge of each of the upper and lower jaws, which grow for life, so they have the habit of grinding teeth. The lower jaw can be moved back and forth, making it suitable for grinding food. There are no canines between the incisors and buccal teeth, and there is a wide tooth gap.

There are 3 upper and lower molars, while the number of premolars varies from species to species. no more than 2 upper premolars, no more than 1 lower premolar; The chewing surface of the molars is either flat or protruding, and the chewing surface is born flat and the molars are concave and lobulated on the sides.

Rodents are: rats, mice, hamsters, porcupines, guinea pigs.

1. Rats

Rat generally refers to a rat. Rats, belonging to the class Mammals, rodents, and rats. Experimental rats are a variant of the brown rat, native to central Asia, and captivity began in the late 18th century, and has been used as experimental animals for experiments at home and abroad in the 19th century.

2. Mice

Mice evolved from the small mus mouse, which is widely distributed all over the world, and has been bred into more than 1,000 inbred lines and independent outbred groups after long-term artificial breeding and selection.

3. Hamsters

Hamsters generally refer to the subfamily Hamsters. Hamster Subfamily: Taxonomically a subfamily within the family Hamsteridae.

There are 18 species in 7 genera, including 8 species in 3 genera in China, commonly known as hamsters. In addition to the small hamsters distributed in Central Asia, the molars have buccal pouches on both cheeks, which can temporarily store food in the mouth and carry it to the hole for storage, so it is also called gills and moving warehouses.

4. Porcupine

The porcupine is an animal of the class Mammal, the family Porcupine, the genus Porcupine, also known as the Chinese porcupine, which is the Chinese subspecies of the Malayan porcupine. Stout build; The body length is 50-75 cm, the tail length is 8-11 cm, and the weight is 10-18 kg.

5. Guinea pigs

Guinea pigs, also known as Dutch rats, Dutch pigs, guinea pigs, and guinea pigs, are classified in zoology as a genus of guinea pigs of the mammalian rodent order Guinea Pig family.