The mouth of the boa constrictor can be opened up and down to about 180 degrees, four rows of teeth can move independently, and there is no chin. The two rows of teeth in the middle of the upper palate can swim up and down, which is conducive to swallowing prey. Its snakeskin can be stretched, so it can swallow prey bigger than itself.

The tongue of the boa constrictor is a chemical detector, the scales can sense whether the prey moves, and the eyes are heat sensors. Their trachea is at the throat, and when they devour the prey, their trachea is outside, so there is no need to worry about tracheal blockage.

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The boa constrictor belongs to ovoviviparous animals, and ovoviviparous refers to a reproductive form in which an animal's eggs are fertilized and developed in vivo. Although the fertilized egg develops into a new individual in the mother.

The nutrition needed for embryo development mainly depends on absorbing the yolk of the egg itself, and the embryo can also exchange some substances with the maternal fallopian tube. This is a breeding mode formed by animals' long-term adaptation to adverse environment.

Amazon boa constrictors only live in South America and love water. Located at the top of the food chain of rivers in South America, it mainly preys on capybara, waterfowl, turtle and even caiman.

Baidu encyclopedia-Amazon boa constrictor