Table 1.
The size and composition of Hainan gibbon groups as of August 2021
| Group | Adult male | Adult female | Immatures | Group size | Notes |
|---|---|---|---|---|---|
| Group A | 2 | 2 | 2 | 6 | One of the adult males was born into this group |
| Group B | 2 | 2 | 4 | 8 | One of the adult males was born into this group and the other immigrated into the group. A new infant was born into this group in January 2021 |
| Group C | 3 | 2 | 3 | 8 | One of the adult males was born into this group |
| Group D | 1 | 2 | 2 | 5 | This group formed in 2015, and initially was composed of one adult male and one adult female. A second adult female joined the group in 2018. In 2019, the original female died, and a new adult female joined the group that same year. A new infant was born into this group in January 2021 |
| Group E | 1 | 1 | 1 | 3 | This group originated in 2019 and its home range borders, but lies outside, the protected reserve |
| Solitary gibbons | 2 | 2 | 1 | 5 | Two adult females, two adult males, and one juvenile have been identified |
| Total | 11 | 11 | 13 | 35 |