I know what you're talking about. I've heard of it <; Biological time sensitivity >: A word? People's reaction speed can never be the fastest, because people's sensitivity to time is relatively weak. (Although from the human sensor officer->; Central nervous system->; The brain reacts quickly, but the brain's response is not the fastest, but the brain is smarter than other animals. Smaller animals (mostly insects) have a strong sense of time, such as ants and flies. People slap flies with a fly swatter quickly, which is a slow action in the eyes of flies (just like a slow movie). Flies live in a high-speed world, so flies can always easily avoid being slapped by humans (even if the speed of flies is similar to that of humans). Have you seen Spider-Man's movie? The protagonist's reaction after being infected by a spider is very incomparable. You can use a tray to catch the fruits and drinks that hit the fly smoothly. Imagine that. Examples: hummingbirds, mice, spiders, flies, ants. . The smaller the body, the faster the heart rate and the less time sensitivity. . So all you have to do is find the smallest animal in the world with the fastest heart rate! According to the investigation, the animal with the smallest heart is an egg bee of the family Braconidae. This egg bee is only 0. 2 1 mm, its weight is only 0. 005 milligrams. Converted, 200,000 only 1 gram,10 million only weighs as much as an egg.