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BIOL 1902 (382)
Lecture

Wk 8.doc

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Department
Biology
Course
BIOL 1902
Professor
Michael Runtz
Semester
Winter

Description
NATURAL HISTORY NOTESWEEK 8ADAPTATIONS FOR FINDING PREY continuedHEARING VERY SPECIALIZED IN BATS DEPEND ENTIRELY ON IT FOR HUNTING SOME ANIMALS FIND THEIR PREY IN A VERY DIFFERENT WAYBATS SEARCH FOR PREY BY USING SONAR HIGH FREQUENCY SOUND BOUNCES OFF OBJECT BACK TO BAT EARS DETECT ANALYSE INSTANTLYBECAUSE BATS LISTEN TO ECHOES CALLED ECHOLOCATION THREE PHASES TO ECHOLOCATION SEARCH PHASE SHORT PULSES HIGH PITCHED SOUND 2030 CALLS PER SEC1DETECTION AND APPROACH PHASE PULSES BECOME SHORTER IN DURATION GIVEN AT FASTER RATE MORE FREQUENTLY 2TERMINAL PHASE FASTEST RATES500 CALLS PER SECONDFEEDING BUZZ WHY FASTER AT ENDFINE RESOLUTION ALLOWS DETECTION OF SMALL INSECTS WHY NOT USE ALL THE TIMEATTENUATES QUICKLY DOESNT TRAVEL AS FARSONAR USED BY OTHER ANIMALSSHREWSOLFACTORY SENSESENSE OF SMELLELONGATED SNOUT with INCREASED NUMBER OF SENSORY CELLS DENSE CONCENTRATIONS IN VOMERONASAL OR JACOBSONS ORGANENHANCE DETECTION BY SMELL BY HUNTING A
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