The more than 1,100 species of bats – about one-fifth of all mammal species – are incredibly diverse. They range from the world's smallest mammal, the tiny bumblebee bat that weighs less than a penny to giant flying foxes with six-foot wingspans. Except for the most extreme desert and polar regions, bats have lived in almost every habitat on Earth since the age of the dinosaurs.
Bats can eat their weight in mosquitos. Some, 1,200 mosquitos every night, making them man’s best night flying friend.Have you ever noticed those night flying creatures that seem to flitter endlessly among date palm trees in the Middle East at night while making distinctive clicking sounds? If you have, chances are these creatures are not birds but Egyptian fruit bats which have been found to have an amazing ability to find their “target” by not aiming their vocal sonar beams directly but by pointing their “sound beams” to either side of the target.
A recent study was made by researchers at Israel’s Weizman Institute of Science, together with the University of Maryland in the USA, and found that their bats emit paired clicking sounds and that the sonar beam created by each click alternated to the left and right of a target. This alternating pattern effectively directed the inside edge, or maximum slope, of each sonar beam onto the target. As a result, any change in the relative position of the target to the bat reflected that large sonar edge back at the bat, delivering the largest possible change in echo intensity.
http://www.batcon.org/
http://www.batcon.org/pdfs/education/batmask1.pdf
http://www.batcon.org/pdfs/bathouses/bathousecriteria.pdf
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