In wildlife research and monitoring, it is crucial for observers to have a shared understanding when observing and recording animal behaviour. One method used to achieve this consistency is interobserver assessment.

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According to the Cambridge Dictionary, interobserver refers to an activity where different individuals observe the same event and report their findings. More specifically, it involves multiple observers monitoring the same subject and recording their observations. This method is essential to ensure that the collected data is consistent and comparable, especially when there are changes in assessment standards or data variables that need updating.

Interobserver at PT RHOI

At PT Restorasi Habitat Orangutan Indonesia (PT RHOI), interobserver assessments began with an initial socialization of ethogram changes in August 2024. Following this, training and observation sessions were conducted to ensure that the entire team understood and could apply the new method correctly. Observations were carried out in two formats: through video recordings and direct field observations. However, direct observations often posed challenges, primarily because orangutans are not always easily encountered in their natural habitat.

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Recently, our Post-Release Monitoring (PRM) team conducted a direct interobserver assessment at Camp Nles Mamse. On that day, three team members—Rasya, Rangga, and Nabillah—encountered an orangutan named Bungaran behind the camp. Bungaran was chosen as their observation subject. Rasya, who had more experience in filling out observation data, served as the reference point for data collection during this interobserver session. The observation lasted for a full two hours.

Challenges During Interobserver Assessment

In practice, observing orangutans is not always easy. Bungaran is known for being active and agile, moving swiftly from one tree to another. This posed a challenge for our team, as they had to navigate through dense vegetation and even cross a river to keep up with his movements. Throughout the observation, Bungaran was primarily engaged in foraging. He tested various types of leaves and young shoots from several trees before eventually disappearing from the team's sight.

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Once the observation was completed, the collected data was analysed to assess the level of agreement between team members in interpreting orangutan behaviour. The results of this interobserver assessment will serve as a basis for evaluating and improving observation methods used by our PRM team in the field. Through interobserver assessments, we aim to enhance data accuracy and gain a deeper understanding of orangutan behaviour in their natural habitat.

Text by: Biodiversity-PRM Team, PT RHOI, Kehje Sewen Forest, East Kalimantan