Table 1. Characteristics of the subjects and index of affiliation shared between partners and non-partners.
| Emitters | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Callisto (F) | Hermes (M) | Nephtys* (F) | Seth* (M) | Sita (F) | Viviane (F) | Wala (F) | Loki (M) | Odin (M) | Skadi (F) | ||
| Subjects | Callisto (F) | / | 0.28 | 0.42 | 0 | 119.75 | 0 | 457.10 | NA | NA | NA |
| Hermes (M) | 0.28 | / | 4.71 | 1.80 | 115.50 | 648.66 | 29.21 | NA | NA | NA | |
| Nephtys* (F) | 0.42 | 4.71 | / | 930.74 | 0 | 4.15 | 1.52 | NA | NA | NA | |
| Seth* (M) | 0 | 1.80 | 930.74 | / | 5.95 | 2.08 | 0.42 | NA | NA | NA | |
| Sita (F) | 119.75 | 115.50 | 0 | 5.95 | / | 99.22 | 231.05 | NA | NA | NA | |
| Viviane (F) | 0 | 648.66 | 4.15 | 2.08 | 99.22 | / | 8.44 | NA | NA | NA | |
| Wala (F) | 457.10 | 29.21 | 1.52 | 0.42 | 231.05 | 8.44 | / | NA | NA | NA | |
| Loki (M) | 0 | 0 | 0 | 0.37 | 0 | 48.92 | 19.10 | / | 3.43 | 35.29 | |
| Odin (M) | 2.29 | 0 | 0.41 | 1.19 | 0 | 5.67 | 28.89 | 3.43 | / | 103.13 | |
| Skadi (F) | 3.93 | 0 | 0 | 0 | 53.06 | 0 | 6.58 | 35.29 | 103.13 | / | |
The sex of birds (F: Female; M: Male) and affiliative indexes of all possible dyads in partners and non-partners duos are shown. Stars * indicate that birds (Nephtys and Seth) are siblings. The matrix needs to be read as follows: subjects’ names are written on the left side of the table and emitters’ names are written on top of the table. The dark grey cells who run diagonally indicate that birds could never hear their own calls. Each horizontal line indicates the affiliation shared between the subject and every other bird. For example, Viviane shares a score of 0 with Callisto, 648.66 with Hermes, 4.15 with Nephtys, 2.08 with Seth, 99.22 with Sita and 8.44 with Wala. No affiliation score was calculated between Viviane, Loki, Skadi and Odin since they hadn't arrived in the lab when Viviane was tested. Each subject heard the calls of an affiliate partner (high indexes in bold underlined numbers) and calls of a non-partner (low indexes in italics underlined numbers). Partner and non-partner for the same subject were same-sex individuals to avoid any bias. Loki, Odin and Skadi arrived after the first seven birds had been tested and could not be used as partners or non-partners at this time (as indicated by the mention “NA” and the light grey cells in the table, see text for details).