Scientists have admitted that mice define, a predator before them or not, on a smell. And authors of work have made the assumption that this special aroma perceives the special body named вомероназальным body. To check up the hypothesis, scientists placed in a cage with mice the wadded balls moistened in the cat's saliva, urine of rats or skin secrets of snakes. Biologists worked with two groups of mice, at one of which because of a mutation didn't function вомероназальный body. Mice from both groups never met predators.

Scientists have found out that causes fear of mice before cats and other predators. Researchers have shown that the fright is provoked by the certain substances containing in urine. Article of scientists has appeared in magazine Cell.

It has appeared that after a premise in a cage of balls animals from "normal" group hide in the corner cages and behave as if before them a dangerous predator. Mice with a mutation in any way didn't change the behavior.

At the subsequent stage of experience experts have tried to establish, what is concrete elements from био liquids of predators стращают mice. Authors have found out that animals react to presence of the basic fibers of urine.

Recently other collective of researchers has conducted research which also reveals features of "use" by live beings of smells. It has appeared that appeal of people to mosquitoes is defined by presence in a smell of certain aldehydes proceeding from the person.