Audiogram of the short-tailed fruit bat (Carollia perspicillata)
Data from: Koay, G., Heffner, R.S., Bitter, K., and Heffner, H.E. (2003) Hearing in American leaf-nosed bats.II: Carollia perspicillata. Hearing Research 178, 27-34.
Absolute thresholds (in dB re 20 µN/m2) for two short-tailed fruit bats
(designated A and B)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|
|
A |
B |
||
|
4 |
74 |
69 |
71.5 |
|
5 |
63.3 |
58.7 |
61 |
|
6.3 |
53.3 |
48.5 |
51 |
|
8 |
40.75 |
37.3 |
39 |
|
12 |
17.3 |
12.8 |
15 |
|
16 |
8.75 |
7.2 |
8 |
|
25 |
1.8 |
-1.75 |
0 |
|
32 |
9.2 |
7.5 |
8.5 |
|
40 |
19.5 |
18 |
18.75 |
|
45 |
31 |
27 |
29 |
|
50 |
38 |
34.75 |
36.5 |
|
56 |
33 |
26.3 |
29.5 |
|
64 |
23 |
24 |
23.5 |
|
71 |
16 |
17.25 |
16.5 |
|
80 |
24.5 |
20 |
22.25 |
|
90 |
28.5 |
24.5 |
26.5 |
|
100 |
29.75 |
26.75 |
28.25 |
|
110 |
30.5 |
28.75 |
29.5 |
|
125 |
26.5 |
31 |
28.75 |
|
140 |
43.5 |
42 |
42.75 |
|
160 |
85.5 |
74 |
79.75 |
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 |
4.15 |
155 |
|
60 |
5.2 |
150 |
|
50 |
6.5 |
143 |
|
40 |
7.9 |
137 |
|
30 |
9.3 |
126 |
Additional Parameters:
Body weight = 15 g
Functional interaural distance= 47 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data.