The Evolution of Bats

The Evolution of Bats

Introduction

Bats (Order Chiroptera, Greek key- ros = ptera = wing hand) are the second or- den of mammals in terms of number of species concerned, only surpassed by the rodents. They con- stitute one of the groups most peculiar and interesting Santes, because they are mammals losunicos-layer ces to fly, concentrating its activities on non- milk or in the twilight hours. Estoultimo has if- do possible by the development of a system of eco- location that allows them to orient even in the more complete darkness. One of the form of mammals Bat which has fur covering and they prodce one offspring per year, they are unique specie not because they produce only once a year but they have perfect design to hang upside down, however they are lazy but can fly very well (Pettigrew, 2006). Bats represent about 20% of all living mammals. It is estimated that there are about 1,100 species, and new ones are discovered regularly. Most are nocturnal so, to fly, emit high frequency sounds that bounce off objects to be captured as an echo from the ears. Conversely, the wing of a bird has a very small number of finger bones. The order is divided into two suborders Microchiroptera are called as small bats and megachiropteran are also called as big bats. All insectivorous bats are microbats, the fruit bats of the old continent; the "flying foxes" are megachiropteran (Denton, 2006). All others are in either, mainly by the size. This paper aims at demonstrating the evolution of Bats based on natural selection functions to change the gene frequency within a population.

Importance

They have become so important because they can fly and thus to exploit resources that other mammals cannot reach. And their rise was inevitable: no other mammal has conquered the air. The wings of bats in flight experience significant stress, the magnitude of which depends on the animal's body size, relative wing area and speed. As the size of animals and their rate of movement increases the load on the wings.

Evolution of Bats

The discovery of the oldest bat fossil found so far has solved the enigma of the evolution of the winged mammal, showing that acquired the ability to fly first and then the echolocation or power to be guided by high-frequency sound waves. Until recently, the origin of bats associated with the primitive arboreal insectivores, which differed from today's shortened muzzles and the presence of webbing between the front and rear. Membrane is initially designed to facilitate the movement when jumping from branch to branch, played the role of a parachute, giving the animal an opportunity to make jumps, gliding flight. This membrane is in the future was supposed to provide material for cheese education committed, are suitable for this flight wings.The fossilized skeleton , found in the Green River Formation in Wyoming (USA), corresponds to a bat that lived more than 55 million years, researchers have detailed the discovery in the latest issue of the British ...