Why does the rabbit's mouth have three petals?

The rabbit's mouth, like other animals, belongs to two lips. This rabbit is very small and good at jumping. It feeds on plants. The rabbit's three-petal mouth can make it more flexible when eating, and its mouth can put short grass on the ground into its mouth. It can also be seen from here that the formation of the three-petal mouth is due to the perennial living habits of rabbits.

The reason why rabbits form three-valved mouths is evolution. Because rabbits are small, they can only eat some short grass and plants, and the front teeth of rabbits are developed and strong, so they need to be turned out to bite off plants and put them in their mouths. The formation of the three-valve mouth can make the front teeth chew food more conveniently, and the rabbits will eat grass more neatly.

Extended data

Other ordinary animals with three mouths:

1, alpaca hair

The alpaca weighs 55-65 kg, with a head and body length of 1200-2250 mm, a tail length of 150-250 mm and a shoulder height of 900-1300 mm. It has a slim figure and neck. Small head, big and pointed ears.

Fur coats are uniform or multicolored. According to the statistics of the Association of Alpaca Owners and Breeders, there are as many as 22 colors of alpaca, ranging from white to black and brown. The upper and lower incisors and canine teeth of adult males develop into bucket teeth or fangs, which can be as long as 3 cm. Women's teeth develop as well as men's. The androgyny of alpacas is not obvious except for the differences in tooth morphology.

2.kangaroos

Kangaroos are strong and have long hind legs; The central index of kangaroos (namely, the index of (calf length/thigh length) × 100, or the index of (tibia length/femur length) × 100) reaches 172, of which red kangaroo reaches 202, far exceeding other animals, while human beings only have an average of more than 80. Kangaroos jump instead of running. They can jump up to 4 meters and as far as 13 meters, which can be said to be the tallest and farthest mammals.

Most kangaroos live on the ground, and it is easy to distinguish them from other animals when they jump from their strong hind legs. Kangaroos keep their balance with their tails when jumping. When they walk slowly, their tails can be used as the fifth leg. Kangaroo's tail is thick and long, full of muscles. It can not only support the kangaroo's body when it is resting, but also help the kangaroo jump faster and farther when it jumps. ?

All female kangaroos have a pouch with an opening in the front, but male kangaroos don't. There are four nipples in the pouch. "Cubs" or kangaroos are kept in nursery bags until they can survive in the outside world.

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