We have many bats that come out at evening twilight time.
They are s-o-o- cool to watch.
Anyone else have them?
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Bats can see very well, probably better than we do at dusk, but even their eyesight needs some light and they would be unable to find their insect prey in the dark. Bats have solved this problem and can find their way about at night and locate their food by using a sophisticated high frequency echolocation system. Our hearing ranges from approximately 20Hz (cycles per second) to 15 to 20 kHz (1000Hz) depending on our age, but bat calls are generally well above this. By emitting a series of often quite loud ultrasounds that generally sweep from a high to low frequency or vary around a frequency, bats can distinguish objects and their prey and therefore avoid the object or catch the insect.
http://i164.photobucket.com/albums/u16/gregg1971/echoloc.gif
They are s-o-o- cool to watch.
Anyone else have them?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Bats can see very well, probably better than we do at dusk, but even their eyesight needs some light and they would be unable to find their insect prey in the dark. Bats have solved this problem and can find their way about at night and locate their food by using a sophisticated high frequency echolocation system. Our hearing ranges from approximately 20Hz (cycles per second) to 15 to 20 kHz (1000Hz) depending on our age, but bat calls are generally well above this. By emitting a series of often quite loud ultrasounds that generally sweep from a high to low frequency or vary around a frequency, bats can distinguish objects and their prey and therefore avoid the object or catch the insect.
http://i164.photobucket.com/albums/u16/gregg1971/echoloc.gif