2.WHY ARE THEY USEFULL?

2.WHY ARE THEY USEFULL?

Bat Diet (for the species that can be found in Europe)
 Today, two thirds of the fauna consists of insects. All bats that live in Romania and Europe are insectivore. On spring, summer and autumn, they have very big appetite. Depending on the species, bats have different preferences for food and can eat beetles (beetles),diptych (flies, mosquitoes), Lepidoptera (butterflies), orthoptere (fen cricket, grasshoppers), araneae (spiders), hemiptere (bed bugs), Hymenoptera (wasp andants), mantidae (nuns), etc. It is very important that not all bats eat the same types of insects, so this fact reduces competition between them and at the same time, there do not remain groups of insects that could multiply in excess.
For example, the twilight bat(Nyctalus noctula) hunts insects in forests, while the common bat(Myotis myotis) and the gray long-eared bat (Plecotul austriacus) feed with insects hiding in the foliage of treesin cities.
Young Bats (juvenile) consume insect larvae mainly with soft body (eg, mosquitoes). For moustached bat (Myotis mystacinus) a forest area of ​​250 sqm is sufficient, while the water bat (Myotis  daubentonii) needs an area of 500 sqm.

 Studies have shown that a colony of 20 million individuals of the same species consumed in one night112500 kg of insects and three months during the summer, approximately 13 500 tons of insects.

The Pollination and Dissemination of Seeds
-In tropical areas bats pollinate and disseminate (through their quickly bowel) the seeds of over 300 trees and shrubs. Few know that the pollination and seed dissemination of the cocoa tree is made exclusively by bats, without this the perpetuation of the tree would become impossible. Similar is the case of the baobab whose flower lasts only during one night, during which the pollination is performed by bats.
-The bats which feed only with fruit contribute to the regeneration and expansion of forests by spreading seeds from fruits that they eat (avocados, bananas, figs, nuts, mango, guava).
Medicine
-Bats have been widely used in traditional medicine. Since the time of Pliny (years 23- 79BC. BC) they were used to reduce it itch of skin, stomach pain, conjunctivitis, hair removal and as an antidote for snake bites
-The saliva of the vampire bat (Desmodus rotundus) has hemolytic esfect, so it is used to produce the necessary drugs in patients undergoing cerebral commotions.


Other Benefits of Mankind.
-Leonardo da Vinci was the first to define the general principles of a flying machine, based on the symbiosis between man and bat wings. The model was constructed by one of the 400drawings of the artist and exhibited nowadays, in a museum in London.
-Traian Vuia, the Romanian engineer and pilot, flew for the first time using a powered device toloosen the soil. The wings of these aircraft were inspired by the shape of a batwing.
-The ecolocation was used by some as a model for building devices to give blind people guidance.