Flanged Male
As of 2025, a cumulative total of 81 individual animals have been observed, with individuals coming and going over time.
Among them, females and younger individuals living around the survey area have been continuously monitored throughout their growth stages, including birth, independence from their mothers, reproduction, and childbirth.
On the other hand, males tend to leave the survey area once they grow and become independent from their mothers, often moving to wider areas. In addition, adult males typically roam across a broad range and only stay temporarily in this region, making long-term monitoring difficult.
Therefore, the records of males are limited to the periods when they were actually observed within the survey area.
Against this background, the 21 individuals observed between 2023 and 2025 are introduced below (mother and offspring are counted as one individual).
Name
Khai
| Sex/Age Class | Unflanged Male |
|---|---|
| Age | 2025 : 22 yrs |
| Mother | Beth (second offspring) |
| Observation History |
|
| Location | Zone : 1–2 |
| Features |
|
Name
Lexi
| Sex/Age Class | Adolescent Female |
|---|---|
| Age | 2025 : 11 yrs |
| Mother | Sumi (3rd offspring) |
| Observation History | ・Born in 2014 |
| Location | Zone : 2 |
| Features |
|
Name
Fara
| Sex/Age Class | Adolescent Female |
|---|---|
| Age | 2025 : 7 yrs (estimated) |
| Mother | Jeny (1st offspring) |
| Observation History |
|
| Location | Zone : 2 |
| Features |
|
Name
Lya
| Sex/Age Class | Adolescent Female |
|---|---|
| Age | 2025 : 11 yrs |
| Mother | Linda (4th offspring) |
| Observation History |
|
| Location | Zone : 3 – 4 |
| Features |
|
Name
Kate
| Sex/Age Class | Adolescent Female |
|---|---|
| Age | 2025 : 14 yrs |
| Mother | Lina (2nd offspring) |
| Observation History |
|
| Location | Zone : 1 |
| Features |
|
Name
Danum
| Sex/Age Class | Adolescent Female |
|---|---|
| Age | 2025 : 14 yrs |
| Mother | Sheena (1st offspring) |
| Observation History |
|
| Location | Zone : 3 - 4 - 5 |
| Features |
|
Name
Yamato with Yan
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025 : 24 yrs(estimated) |
| Offspring’s Age | 2025 : 3–4 yrs (estimated) |
| Offspring’s Sex-Age Class | Juvenile Female |
| Mother | Yamato's mother : Sumi (1st offspring) |
| Observation History |
|
| Birth History |
|
| Location | Zone: 1 - 2 |
| Features |
|
Name
Bob with Bidee
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025 : over 22 yrs (estimated) |
| Offspring’s Age | 2025 : 6 yrs |
| Offspring’s Sex-Age Class | Juvenile Male |
| Mother | Bob's mother : Siti (first offspring) |
| Observation History |
|
| Birth History |
|
| Location | Zone: 3 - 5 |
| Features |
|
Name
Amy with Gab
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025 : over 27 yrs (estimated) |
| Offspring’s Age | 2025 : 3 yrs |
| Offspring’s Sex-Age Class | Juvenile Male |
| Observation History |
|
| Birth History |
|
| Location | Zone: 1 and Beyond Zone 1 |
| Features |
|
Name
Sheena with Elis
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025 : over 29 yrs (estimated) |
| Offspring’s Age | 2025 : 6 yrs |
| Offspring’s Sex-Age Class | Juvenile Female |
| Observation History |
|
| Birth History |
|
| Location | Zone:3–4 |
| Features |
|
Name
Jeny with Jimy
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025: over 25 yrs (estimated) |
| Offspring’s Age | 2025 : 2 yrs |
| Offspring’s Sex-Age Class | Infant Female |
| Observation History |
|
| Birth History |
|
| Location | Zone : 1-2 |
| Features |
|
Name
Helen with Lucy
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025 : over 28 yrs (estimated) |
| Offspring’s Age | 2025 : over 5 yrs (estimated) |
| Offspring’s Sex-Age Class | Juvenile Female |
| Observation History |
|
| Birth History |
|
| Location | Zone : 1 |
| Features |
|
Name
Sumi with Dona
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025 : Over 37 yrs (estimated) |
| Offspring’s Age | 2025 : 0 yrs |
| Offspring’s Sex-Age Class | Infant Female |
| Observation History |
|
| Birth History |
|
| Location | Zone : 2 |
| Features |
|
Name
Linda with Lony
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025: Over 41 yrs (estimated) |
| Offspring’s Age | 2025 : 1 yrs |
| Offspring’s Sex-Age Class | Infant Female |
| Observation History |
|
| Birth History |
|
| Location | Zone:3–5 |
| Features |
|
Name
Beth with Lan
| Sex/Age Class | Mother-offspring pair |
|---|---|
| Mother’s Age | 2025: Over 46 yrs (estimated) |
| Offspring’s Age | 2025 : 4 yrs |
| Offspring’s Sex-Age Class | Juvenile Male |
| Observation History |
|
| Birth History |
|
| Location | Zone:1–2 |
| Features |
|
Name
Lom
| Sex/Age Class | Unflanged Male |
|---|---|
| Age | 2025: 15 yrs |
| Mother | Beth (third offspring) |
| Observation History |
|
| Location | Zone：1 |
| Features |
|
Name
Mike
| Sex/Age Class | Flanged Male |
|---|---|
| Age | 2025: Over 42 yrs (estimated) |
| Observation History |
|
| Location | Zone :1 |
| Features |
|
Name
Oni
| Sex/Age Class | Flanged Male |
|---|---|
| Age | 2025 : Over 35 yrs (estimated) |
| Observation History |
|
| Location | Zone:1-2 |
| Features |
|
Name
Son
| Sex/Age Class | Flanged Male |
|---|---|
| Age | 2025: Over 38 yrs (estimated) |
| Observation History |
|
| Location | Zone:1-2-3 |
| Features |
|
Name
Gotenz
| Sex/Age Class | Flanged Male |
|---|---|
| Age | 2025: Over 37 yrs (estimated) |
| Observation History |
|
| Location | Zone:1-2-3 |
| Features |
|
Name
Chris
| Sex/Age Class | Adolescent Male |
|---|---|
| Age | 2025: 9 yrs |
| Mother | Amy (first offspring) |
| Observation History |
|
| Location | Zone 1–2 and Beyond Zone 1 |
| Features |
|
Research Area
※Zones 1 to 5 represent the areas most frequently utilized by each individual within the BRL grounds.
However, due to the wide-ranging behavior of orangutans, they may also move across different zones.
※Based on information provided by Borneo Rainforest Lodge