Squid and sidewall hovercraft squid are fast marine animals, known as sea rockets, and their maximum speed can reach one hundred and fifty kilometers per hour, which mainly depends on their simple structure and safe and reliable high-speed water jet propeller. People imitate it and make it into a sidewall hovercraft with a water jet propeller. The speed can reach 40 meters per second and it can sail quickly in shallow water less than one meter deep. Butterfly and satellite temperature control system When the artificial earth satellite travels in space, it is strongly radiated by sunlight, and it is easy to "bake" or "freeze" all kinds of precision instruments on the satellite. A layer of tiny scales grows on the body surface of butterflies, which can regulate body temperature. Taking butterflies as teachers, scientists designed a temperature control system similar to butterfly scales for artificial satellites. Bats and Blind Glasses Bats can judge the distance of obstacles in the dark because they can emit an ultrasonic wave and have a "radar device" to receive this ultrasonic wave, so as to accurately identify obstacles and their positions. Based on this, scientists have developed ultrasonic glasses to bring good news to the blind. The efficiency of fireflies and flash fireflies to convert chemical energy into light energy is almost 100%, while the efficiency of ordinary electric lamps is only about 6%. The heat emitted by fireflies is only a quarter of a degree Celsius. With the in-depth study of firefly luminescence, people have made flash lamps and underwater lighting lamps for mine water by using light sources. Jellyfish and TV camera jellyfish have two pairs of eyes on the back shell, and there are 1000 pairs of compound eyes on both sides. When it finds the shadow of the fish, it can increase the clarity of the target by highlighting the boundary, thus obtaining the outline of the fish. People imitated the principle of horseshoe crab eyes and developed TV cameras.