kodomodragon
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1 mo. ago·edited 1 mo. ago
Sir David Attenborough wannabe
I think it's worth sharing a bit more about Smooth-coated Otters to address some of the concerns others have brought up. The otter population has grown because of the abundance of food and other factors, but there are now fewer available territories, and their fiercely territorial nature means that there's limited ability for the population to grow much further.
TL;DR: Otters are fiercely territorial, the population will limit itself as it gets more crowded, life in the wild is not as easy as it seems and there is frequent mortality, culling is unwarranted, people need to learn how to behave themselves around wildlife.
Smooth-coated Otters are living in Singapore's urban areas because we've created conditions that allow them to thrive – our reservoirs and canals are clean enough to have abundant populations of (mostly invasive) fishes, with vegetation and potential denning sites. And scattered among them, we have even easier sources of food in the form of small ponds and water features stocked with colourful koi and other large ornamental fishes, and no barriers to exclude fish-eating predators. The majority of the otter families found in Singapore prefer to stay away from humans, and are not as habituated to our presence as the otters from the Bishan and Zouk families. There's so much attention and publicity focused on a handful of families because they live in urban areas, and go about their daily activities with humans in close proximity virtually all the time, when most of the otters live along our coastlines, in the mangroves, and in the quieter parts of our reservoirs and larger waterways.
Smooth-coated Otters are dependent on live fish – random people have thrown bread, biscuits, and even dead fish at wild otters, but these were rejected. They don't resort to scavenging trash, or snatching food from people. This is very much unlike the Wild Boar and Long-tailed Macaque, which are forest mammals that are readily lured into urban areas because of a combination of habitat loss and easy access to human sources of food, quickly become habituated to human feeding, and whose populations can rapidly increase and cause serious conflict because of feeding, whether deliberate or accidental. On the other hand, while otters are adapting to a manmade environment, they are still going after what can be considered their natural diet; they're not approaching humans to steal our snacks. To them, humans are just another creature in the environment; some otters are more tolerant of our presence (because they don't really have much of a choice), but they still don't see humans as a source of food. The behaviour is still natural, even if the setting isn't.
Each family of Smooth-coated Otters controls a large territory, which it fiercely defends from intruders. So every reservoir, large waterway, or stretch of coastline in Singapore is usually the domain of a single family. For example, the Bishan family controls much of Kallang River, Kallang Basin, Marina Reservoir, and the Singapore River. There are some areas of overlap, but rival clans keep to themselves, and if they ever meet, the results can be bloody, especially when a group has a clear numerical advantage. There are at least 3 much smaller families known to use Marina Reservoir, but they are very elusive and go to great lengths to avoid the Bishan family, because any close encounter with them will likely have fatal consequences. The Zouk and Sentosa families, which are also quite large, visit Marina Bay once in a while, but only when the Bishan family is away and spending more time at Kallang Basin.
Within each family, usually only the parents (the alpha pair) will breed – the rest are all young from successive litters. There are records of pups being born to the Bishan family that were not the offspring of the alpha pair, but these are very exceptional cases. So all the videos and photos of large groups of Smooth-coated Otters still essentially show a single breeding pair and their offspring.
Even after reaching adulthood, pups often stay with the family for a few years, helping to raise their younger siblings, but they will eventually disperse, striking out on their own in the hopes of finding a partner, establishing a new territory, and starting a family. Sightings of lone otters or small groups of adults without pups are typically young adults that have dispersed from their families – without safety in numbers, they're more vulnerable to threats. They roam about, usually staying out of the way of the family whose territory they're "trespassing" upon, because a clash with the resident clan may turn deadly. But the fate of most of these young adults is unknown. Between all the pups that have been born and subsequently dispersed over the years, and all the newer families that have formed recently, not all of them can be accounted for.
The lucky lone otters manage to meet up, find a suitable area that's unoccupied, and start a family. The Bishan family began that way – at first it was a lone otter hanging out at Bishan-Ang Mo Kio Park, who then found a mate. They had a litter, and the rest is history. Similarly, the founders of the Zouk family are suspected to be a daughter that dispersed from the Bishan family, and a male from the Marina clan.
Some lone otters are able to join families that have just lost a parent, and then become part of the new alpha pair. Not long after the original Bishan Dad died in 2018, a lone male nicknamed Scarface introduced himself, and was accepted as Bishan Mum's new mate.
Once a pup grows up and leaves the family, the familial ties are completely severed; even though the Zouk alpha pair may be the offspring of the Bishan and Zouk families, there's no recognition of kinship during subsequent encounters. Sometimes, a group of siblings will disperse from the family, but if one of them manages to find a mate and starts its own family, the rest of the siblings will eventually go their separate ways.