Elephants are large animals, but despite that their ears are very disproportionate to its head. Use it to fan and lowering the body temperature, and that 20 minutes can make all the blood passing through them. But a few years ago it was discovered that also serve to communicate. The communication system is based on elephants emit infrasound very low frequency sounds and inaudible to humans. They do this by moving his large ears, as they create a sound that only they can hear. Are vibrations of air that elephants can get to hear with ears that have developed in size and shape.
The infrasound are low-frequency sound waves that contain a lot of energy, which are slow to dissipate through the air. This means that elephants communicate with each other over long distances, ten or fifteen miles.
Its sophisticated communication system is very useful to them in the crater-Ngoro Ngoro. In this large crater there accumulated rain water and vegetation to eat. But the problem that there are predators who also know the place and they know it is difficult to escape. The male elephants enter the zone and find that there are no predators. Then communicate with the females and the young to climb the crater and down to where the food is. This communication is only possible through infrasound, as these can be heard several miles away. And we humans and we learn, as infrasound are below our threshold of hearing, located at 20 Hertz.
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