Audiogram of Alpaca (Vicugna pacos)
Data from: Heffner, R.S.,Koay, G., and Heffner, H.E. (2014) Hearing in alpacas (.025): Audiogram, localization and use of binaural locus cues. Journal of the Acoustical Society of America 135, 778-788.
Absolute thresholds (in dB re 20 µN/m2) for two deer (designated A and B)
|
Frequency (in kHz) |
Individual Thresholds (in dB) |
|||
|
A |
B |
C |
Average |
|
|
.025 |
68 |
68 |
76 |
70.67 |
|
.032 |
62 |
62 |
69 |
64.33 |
|
.063 |
48.5 |
50 |
53 |
50.5 |
|
.125 |
35.5 |
39 |
38.5 |
37.67 |
|
.250 |
17.5 |
17.5 |
19.5 |
18.17 |
|
.500 |
12 |
12 |
14 |
12.67 |
|
1 |
10 |
9 |
10 |
9.67 |
|
2 |
13.7 |
12.5 |
12 |
12.73 |
|
4 |
3.3 |
3.2 |
3.2 |
3.23 |
|
8 |
-1 |
1 |
-1.8 |
-0.6 |
|
16 |
13.2 |
9.2 |
11 |
11.3 |
|
22.5 |
23.5 |
19 |
28.25 |
23.58 |
|
32 |
54.9 |
60 |
58.4 |
57.7 |
|
40 |
76.4 |
78.4 |
82 |
78.93 |
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 |
.025 |
36 |
|
60 |
.040 |
32.8 |
|
50 |
.063 |
29 |
|
40 |
.110 |
26.5 |
|
30 |
.150 |
24 |
Additional Parameters:
Body weight = 63 kg
Functional interaural distance= 544 µs
(Time required for sound to travel around the head from one auditory meatus to the other.)
Comments: Threshold values taken from original data.