Similarities and differences in appearance between horses and donkeys

1, ears are different: horses have small upright ears and a long face; The donkey has a big head, long ears and a slightly narrow chest.

2, the limbs are different: the horse has strong limbs, cicadas on the inside, and slender legs; Donkeys have thin limbs, short trunk and short and thick legs.

3, the coat color is different: the horse coat color is complex, including enamel, chestnut, blue, black and so on; Donkeys are like horses, mostly grayish brown.

4. Different shapes: the horse is tall and mighty; Donkeys are short because their limbs are short.

5. Different characteristics: horses are good at running; Donkeys are not good at running. Horses run faster; Donkeys are slower than others.

2. Similarity: Both horses and donkeys belong to the same genus, and both horses and donkeys belong to the Chiroptera Equidae. The figure is symmetrical, the limbs are long, the third toe is hoofed, and the second and fourth toes are degenerated, leaving only the degenerated metacarpals and metatarsals. The middle axis of the foot passes through the middle toe, and the first toe (thumb) and the fifth toe have generally disappeared, so that only three toes are usually working in the front and rear feet.

The progressive horse even has 1 toe. The toe end is a hoof, but there is a branch at the toe end that is a claw. In the ankle joint of Chiroptera, the proximal talus has a double convex pulley-like surface, which is related to the tibia, while the distal end is a plane, which is connected with other bones in the ankle joint.

The femur of Chiroptera has a protruding protrusion on the outside of its axis, which is called the third rotor. The front teeth are usually intact, forming an effective organ for cutting plants, and the canine teeth degenerate or disappear; The premolars gradually tend to be highly molar in the evolution process.

Reference: Baidu Encyclopedia-Horse Reference:

Baidu encyclopedia-donkey