How do you count Singapore's wild otters?

Key Concepts

• Changi Bayoin Family: An elusive family of otters being tracked during a census.
• Otter Census: A systematic count of otter populations, requiring precise identification to avoid double-counting.
• Individual Otter Identification: Utilizing unique physical characteristics (markings, chipped teeth) for tracking.
• Otter Spraint: Otter feces, used as evidence of passage and diet analysis (fish scales, bones).
• PCN (Park Connector Network): Pathways used for observation.

The Elusive Changi Bayoin Family & Otter Census Methodology

The speaker recounts a particularly memorable experience during an otter census – the successful sighting of the Changi Bayoin family, a group previously unobserved. Initial attempts by other observers during the first month of the census proved unsuccessful. The speaker decided to dedicate effort in the second month, choosing a location where a strong “spring” smell (likely referring to the scent associated with otters) was present. Despite this promising sign, the family remained hidden from view.

The speaker employed a patient observation strategy, sitting on the Park Connector Network (PCN) and using binoculars to scan a dimly lit area. After approximately ten minutes, movement was detected, and the family began to emerge, exiting their den in a single-file line towards the sea. The speaker was able to capture video evidence of the entire family, marking the first confirmed sighting during the census. The speaker emphasizes the significance of this sighting, stating, “I think without my sight I think we this family might not have been included in census at all. So we’ll be 13 author short for the census.” This highlights the importance of dedicated observation in accurate population assessment.

Rigorous Otter Identification Processes

The census process is described as “quite a rigorous” one, specifically designed to prevent double-counting of otters. This is achieved through long-term observation and a keen attention to detail. The methodology relies on identifying individual otters based on “minute differences in the appearance of each other.” Specific examples provided include “markings on the body” and physical anomalies like “some author’s tooth is chipped.” These unique characteristics serve as identifiers, allowing researchers to track individuals and, consequently, their families.

Evidence of Otter Passage: Analyzing Spraint

The speaker details how evidence of otter passage is identified, specifically referencing “sprint” – otter feces, also known as spraint. This spraint is found at locations like Bishan Park’s large pond. The speaker provides a detailed description of spraint’s appearance, noting that it contains remnants of the otters’ diet. “There’s a lot of it since the black ones and like the transparent thingies that you see are actually fish scales.” Fresh spraint is described as “brown and jellyish,” while dried spraint appears white and contains “fish bones that are chewed up to 1 cm.” This observation leads to a practical safety recommendation: “That’s why we say don't go so close to them.”

Logical Connections & Synthesis

The narrative progresses logically from the initial challenge of locating the Changi Bayoin family, through the detailed observation process employed, to the explanation of the broader census methodology and the use of spraint as evidence. The speaker seamlessly connects personal experience with the technical aspects of otter research.

The main takeaway is the importance of meticulous observation and detailed data collection in wildlife census efforts. The successful sighting of the Changi Bayoin family underscores the value of dedicated fieldwork, while the explanation of individual identification and spraint analysis demonstrates the scientific rigor applied to otter population monitoring. The speaker’s anecdote highlights that seemingly small details – a scent, a chipped tooth, fish scales in feces – are crucial for accurate data and effective conservation.