Tears are sexually attractive to Female Mice

Male mice shed tears to keep their eyes hydrated, and the tears will get spread to their bodies and nests. These tears that they shed contain ESP1, which is a sex pheromone that would make female mice more willing to incline to mounting. When a female mice comes in contact with these tears, a nose organ called the vomeronasal will pick up the pheromone and send it the the sex-region in the brain, and increasing the chances of the lordosis behavior by three times. Surprisingly, scientists have found that pheromone are expressed strongly by wild mice while laboratory mice mostly don't, which led to a decrease in the breeding of laboratory mice. ESP1 can also be found in the tears of other animals. However, human tears do not contain ESP1, but that's alright, because humans have their own special way of attracting mates.

This article relates to biology concepts, because scientists have discovered a new finding in mice that explains how male mice are able to sexually attract female mice. This certain sex pheromone might also be the answer to how many other animals are able to breed and mate.

Even though we're not mice ourselves, we should care about this matter, because it is a reasoning to how many animals breed, and we can learn from it and understand how perhaps one sex pheromone can lead to increased population in animals.

Source: http://news.nationalgeographic.com/news/2010/07/100701-science-animals-mating-mice-mouse-aphrodisiac-tears/