Audiogram of the little brown bat (Myotis lucifugus)
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Data from: Dalland, J.I. (1965) Hearing sensitivity in bats. Science,150, 1185-1186.
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Absolute thresholds (in dB re 20 µN/m2) for a single little brown bat
|
Ìý Frequency (in kHz) |
Average Threshold (in dB) |
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| Ìý | ||
|
10 |
(65) |
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|
12.5 |
20 |
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|
15 |
28 |
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|
20 |
17 |
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|
25 |
15 |
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|
35 |
18 |
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|
40 |
10 |
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|
45 |
19 |
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|
50 |
22 |
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|
55 |
17 |
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|
60 |
15 |
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|
70 |
27 |
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|
80 |
24 |
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|
90 |
22 |
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|
100 |
29 |
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|
120 |
72 |
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Lowest and highest frequencies audible at sound
pressure levels (SPL) ranging from 30 to 70 dB SPL
|
SPL (in dB) |
Lowest audible frequency (in kHz) |
Highest audible frequency (in kHz) |
|
70 |
10 |
120 |
|
60 |
10.3 |
115 |
|
50 |
10.9 |
109 |
|
40 |
11.3 |
104 |
|
30 |
12 |
100 |
Additional Parameters:
Body weight =6 g
Functional interaural distance=41 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
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Comments: Threshold values taken from graph in Dalland,1965.how many bats??