Why can rattlesnakes and bats "see" the world invisible to human beings?

When encountering an enemy or moving quickly, the tail ring of the tail can swing 40 to 60 times per second quickly, which can make a loud noise for a long time, so that the enemy is afraid to approach or be scared away, so it is called a rattlesnake. There is a buccal fossa between the eyes and nostrils, which is a sensitive receptor of heat energy. It can be used to detect the exact position of the surrounding enemies (warm-blooded animals), and it can be used to accurately know the position of small animals. There are horny rings on the snake's tail, and these horny rings enclose a cavity. When its tail shakes, there is air vibration and sound in the cavity. This kind of sound is a predatory method used to warn enemies and lure small animals.

Carnivorous, like to eat mice and rabbits, but also eat lizards, other snakes and birds. Many people often get together and go into hibernation. Viviparous, with as many as 8 ~ 15 snakes per nest. Mainly distributed in South America and North America.

Rattlesnakes have special organs in their heads. They can use infrared rays to sense hot animals nearby. The biting ability of rattlesnakes after death is the reflection from these infrared sensing organs; Even if other body functions of the rattlesnake have stopped, as long as the sensory organs and tissues of the head are not rotted, that is to say, the rattlesnake can still detect the creatures emitting heat in the vicinity of 15 cm within one hour after death, and automatically respond to the attack. According to this principle, scientists invented many peripheral commodities, which were widely used in the military. For example, the "Sidewinder Missile" AIM-9 is the first infrared guided air-to-air missile in the world. Infrared devices can guide missiles to track hot targets, just as rattlesnakes can sense the body temperature of nearby animals and accurately capture prey.

bat

Bats are the only mammals that have evolved the real ability to fly. They live in caves, ceilings, partitions, tree holes and crevices in ancient buildings, while some fruit-eating bats in the south still hide behind the leaves of palm trees and banana trees. Some bat populations have thousands of bats together, some bats live together, and some bats live separately. Many bats living in the forest migrate to warm areas in winter, sometimes flying thousands of miles. Cave bats in temperate zones usually hibernate. Bats breed only once a year. In the early warm season, bats will give birth.

Bats that feed on insects have echolocation systems to varying degrees, so they are called "live radars". With the help of this system, they can fly and catch food in complete darkness, use echolocation under a lot of interference, and send out ultrasonic signals without affecting normal breathing. There are structures called "nasal lobes" on the nose and mouth of their heads, and there are complex special skin folds around them.

This is a peculiar ultrasonic device, which has the function of emitting ultrasonic waves and can continuously emit high-frequency ultrasonic waves. If you encounter obstacles or flying insects, these ultrasonic waves can be reflected back and then received by their extraordinary big auricles, so that the feedback information can be analyzed in their tiny brains. This kind of ultrasonic detection has high sensitivity and resolution, so that they can not only identify the direction and locate their own flight path according to the echo, but also identify different insects or obstacles for effective avoidance or pursuit.