Table 2.
Discrimination of chimpanzee call types.
| Call (unit) type | Abbreviation | Fundamental frequency (f0) | Shape of f0 | Noisiness | Single/ panted | Occurrence in the repertoire |
|---|---|---|---|---|---|---|
| Grunt | GR | 70–700 Hz | Variable | Noisy | Single | 2087 (27.1%) |
| Panted grunt | PG | 100–200 Hz | Variable | Noisy | Panted | 853 (11.1%) |
| Hoo | HO | 200–700 Hz | Flat | Highly tonal | Single | 1561 (20.3%) |
| Panted hoo | PH | – | Flat | Highly tonal | Panted | 1015 (13.2%) |
| Bark | BK | 600–2000 Hz | Dome | Variable | Single | 337 (4.4%) |
| Panted bark | PB | 600–2000 Hz | Dome | Variable | Panted | 549 (7.1 %) |
| Pant | PN | 100–200 Hz (if visible) | Flat (if visible) | Noisy | Panted | 402 (5.2%) |
| Scream | SC | 800–2000 Hz | Flat midsection | Variable | Single | 312 (4.1%) |
| Panted scream | PS | 800–2000 Hz | Flat midsection | Variable | Panted | 317 (4.1%) |
| Non-vocal sounds (lip smack, raspberry) | NV | – | – | Noisy | Single | 184 (2.39%) |
| Whimper | WH | 350–1300 Hz | Flat | Highly tonal | Single | 78 (1.0%) |
| Panted roar | PR | 200–300 Hz, with bands below F0 (<100 Hz) | Flat | Noisy | Panted | 1 (0.01%) |