Audiogram of the megachiropteran Egyptian fruit bat (Rousettus aegyptiacus)
Data from: Koay, G., Heffner, R.S., and Heffner, H.E. (1998) Hearing in a megachiropteran fruit bat, Rousettus aegyptiacus. Journal of Comparative Psychology, 112, 371-382.
Absolute thresholds (in dB re 20 µPa) for two
Egyptian fruit bats (designated A and B)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|
|
A |
B |
||
|
1 |
79 |
84 |
81.5 |
|
2 |
63 |
66 |
64.5 |
|
2.8 |
47 |
56 |
51.5 |
|
4 |
39 |
42 |
40.5 |
|
5.6 |
29 |
29 |
29 |
|
8 |
9 |
10 |
9.5 |
|
10 |
4 |
4 |
4 |
|
12.5 |
6 |
5 |
5.5 |
|
16 |
11 |
8 |
9.5 |
|
20 |
8 |
8 |
8 |
|
25 |
7 |
8 |
7.5 |
|
32 |
25 |
25 |
25 |
|
40 |
16 |
17 |
16.5 |
|
45 |
13 |
13 |
13 |
|
50 |
20 |
17 |
18.5 |
|
56 |
42 |
26 |
34 |
|
64 |
66 |
53 |
59.5 |
|
71 |
82 |
75 |
78.5 |
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 |
1.6 |
68 |
|
60 |
2.25 |
64 |
|
50 |
2.95 |
61 |
|
40 |
4.05 |
58 |
|
30 |
5.5 |
54 |
Additional Parameters:
Body weight = 163 g
Functional interaural distance = 137µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data.