Audiogram of the groundhog (Marmota monax)
Data from: Heffner, R.S., Koay, G., and Heffner, H.E. (2001) Audiograms of five species of rodents: Implications for the evolution of hearing and the encoding of pitch. Hearing Research, 157, 138-152.
Absolute thresholds (in dB re 20 µN/m2) for four groundhogs (designated A through D
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
Average |
|||
|
A |
B |
C |
D |
||
|
.032 |
71 |
65 |
61 |
57 |
63.5 |
|
.063 |
59 |
55 |
48 |
50 |
53 |
|
.125 |
43 |
42 |
38 |
29 |
38 |
|
.250 |
40 |
40 |
34 |
31 |
36 |
|
.500 |
29 |
34 |
26 |
— |
30 |
|
1 |
34 |
27 |
25 |
— |
29 |
|
2 |
28 |
26 |
29 |
28 |
28 |
|
4 |
24 |
20 |
22 |
20 |
21.5 |
|
8 |
20 |
19 |
22 |
26 |
21.8 |
|
16 |
37 |
32 |
38 |
37 |
36 |
|
22.4 |
31 |
35 |
32 |
34 |
33 |
|
28 |
— |
— |
63 |
— |
63 |
|
32 |
75 |
77 |
89 |
83 |
81 |
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 |
.021 |
29.5 |
|
60 |
.040 |
27.5 |
|
50 |
.072 |
25.5 |
|
40 |
.113 |
23.5 |
|
30 |
.500 |
12 |
Additional Parameters:
Body weight = 7 kg
Functional interaural distance= 290 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data.