Unusual creatures called Avir were exposed to a number of genetic mutations over the millennia. On the planet are found remains of an ancient miyan ship, who are known for their biotechnology, so it is assumed that numerous mutations of flora and fauna in a large area result of some of their technologies.

Avir have two consciousnesses - in each head is a carrier of the individual. Nevertheless, they share a common body and the nervous system.
They have common taste and tactile receptors, but hearing, sight and smell is divided for each head.

Lower body is controlled by "front" head, torso with the working limbs, - respectively, "top" head.

There are two pairs of lungs and two hearts, other organs located in the "lower" body.

On culture and way of life, little is known: the level of technology is low, settlements are small.

Used machine translation.