Audiogram of the little brown bat (Myotis lucifugus)
Data from: Dalland, J.I. (1965) Hearing sensitivity in bats. Science,150, 1185-1186.
Absolute thresholds (in dB re 20 µN/m2) for a single little brown bat
|
Frequency (in kHz) |
Average Threshold (in dB) |
|
|
10 |
(65) |
|
|
12.5 |
20 |
|
|
15 |
28 |
|
|
20 |
17 |
|
|
25 |
15 |
|
|
35 |
18 |
|
|
40 |
10 |
|
|
45 |
19 |
|
|
50 |
22 |
|
|
55 |
17 |
|
|
60 |
15 |
|
|
70 |
27 |
|
|
80 |
24 |
|
|
90 |
22 |
|
|
100 |
29 |
|
|
120 |
72 |
|
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.)
Comments: Threshold values taken from graph in Dalland,1965.how many bats??