Lyla Lindsey
Otters have existed on Earth for over 30 million years, with 13 recognized species. One of these species is the small-clawed otter, which is the smallest of all otter species. Otters are a vulnerable species due to threats such as habitat destruction, waterway pollution, and the fur trade. While otters are not indigenous to Australia, the country is home to the rakali, a semi-aquatic species that exhibits otter-like characteristics.
| Characteristics | Values |
|---|---|
| Otter species found in Australia | Small-clawed otter, Rakali |
| Otter family | Mustelid |
| Other animals in the Mustelid family | Ferrets, weasels, badgers, skunks, minks |
| Otter characteristics | Small stature, small claws, sharp upper teeth |
| Otter diet | Fish, rodents, crabs, snails |
| Otter habitat in Australia | Tasmania, northern Australia, South West WA, permanent water systems |
| Rakali colour | Black to brown with an orange to white belly, dark tail with a white tip |
| Rakali diet | Fish, crustaceans, shellfish, small birds, eggs, mammals, frogs, reptiles |
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What You'll Learn
Small-clawed otters are found in Australia Zoo
Otters have been on the planet for over 30 million years, but sadly, they are now a vulnerable species due to the increasing threat of habitat destruction, waterway pollution, and the fur trade. One of the 13 otter species found around the world is the small-clawed otter, which can be found in Australia Zoo.
Small-clawed otters are the smallest of the 13 otter species. They are typically brown with a pale underside, small head, short legs, and a flattened tail. This combination gives them a streamlined body shape that allows for efficient movement through the water. They are very vocal, with at least 12 different vocalizations used to signal contact, greeting, summoning, threatening, and alarming. They also communicate through social grooming, posture, and chemically, like other members of the Mustelidae family.
The small-clawed otter is part of the Mustelid family, which includes ferrets, weasels, badgers, skunks, and minks. They are distinguished by their small stature and claws, which do not protrude beyond their fingers. Despite their small size, they have big personalities and an even bigger appetite, eating one-third of their body weight every day. They can feed on shelled animals like crabs and snails, as well as fish and rodents, thanks to their sharp upper teeth.
At Australia Zoo, visitors can spot these adorable small-clawed otters playing and exploring their home throughout the day. The zoo offers an "Utterly Outrageous Otters Encounter," where guests can enjoy lunchtime with these cheeky animals. However, it's important to remember that all animals may exercise their natural instincts, and guests should follow the handlers' directions when interacting with the otters.
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Otters are a vulnerable species
Otters have existed on Earth for over 30 million years, but they are now a vulnerable species. While otters are not native to Australia, with only small-clawed otters found in zoos, otter populations around the world are at risk of extinction due to various threats.
One of the primary threats to otters is habitat destruction. Otters rely on healthy aquatic environments, and the loss or degradation of their habitats can have severe impacts on their populations. For example, southern sea otters historically ranged throughout the California coast but were nearly driven to extinction by the early 1900s due to hunting. While they have been protected under the Endangered Species Act since 1977, their range remains restricted due to severe kelp losses, creating a lack of kelp canopy and high-risk areas for shark attacks.
Waterway pollution is another significant factor contributing to the vulnerability of otters. Oil spills from large vessels pose a direct threat to sea otters, and the slow pace of natural range expansion exacerbates the issue. Additionally, harmful algal blooms, ocean acidification, and contaminants generated by human activity further endanger otter populations. Research has shown that algal toxins are slowly destroying the hearts of southern sea otters, leading to a decline in their population.
The illegal pet trade and the demand for otter skins also pose significant risks to otters. Asian small-clawed otters are commonly traded as pets, while smooth-coated otters are in high demand for their pelts. Between 1980 and 2018, there were over 250 seizures involving 6,010 individual otters, according to the CITES trade database. The growing popularity of "otter cafes" and the online sale of otter pelts further fuel the illegal trade of these vulnerable species.
While there have been conservation wins, such as the highest protection awarded to vulnerable otters by CITES, the combination of threats continues to make otters a vulnerable species. The future of otters depends on ongoing efforts to protect and restore their habitats, regulate the trade, and address the various environmental challenges they face.
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Rakali is a semi-aquatic species found in Australia
Rakali, also known as the 'water rat', is a semi-aquatic rodent species native to Australia. It is the largest of all Australian native rodents and can be found anywhere in Australia where there is water all year round. Their only habitat requirements are clean water and plenty of vegetation. They live in burrows on the banks of rivers, lakes, estuaries, and protected coastal beaches and islands. They are well adapted to both saltwater and freshwater environments and can even be spotted in inner cities.
The rakali is a nocturnal species, but when needed, they can also be found scavenging during the day. They are predominantly carnivorous and feed on a variety of aquatic animals, including fish, crustaceans, shellfish, small birds, eggs, mammals, frogs, and reptiles. They have also been known to eat the heart and liver of the toxic cane toad, which has been introduced to Australia. Rakali have learned to avoid the toad's poisonous shoulder glands by flipping them onto their backs.
The rakali is a relatively large rodent, with a body length of 23-37 cm and a weight of 340-1,275 g. They have a thick tail measuring around 24-35 cm, and females are generally smaller than males. They are a durable species and can survive in most conditions, even polluted waterways. However, they are threatened by habitat degradation and loss, as well as predation by introduced species such as foxes and cats. They are also sometimes mistakenly trapped and killed by people who confuse them with pest rats.
The rakali plays an important role in Australia's aquatic ecosystems. They help disperse fungi spores, which assist plants in extracting water and nutrients from the soil. They are also one of Australia's only two semi-aquatic mammals, the other being the platypus.
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The species is also known as water-rat
Otters are not native to Australia, however, the country is home to a species that closely resembles them, the rakali, or water-rat (Hydromys chrysogaster). This species is native to the Australian mainland, Tasmania, and several offshore islands. They occupy a wide variety of natural and man-made freshwater habitats, including swamps, ponds, lakes, rivers, creeks, and irrigation channels. They also inhabit brackish estuaries and sheltered ocean beaches.
The rakali is the most specialised of the Hydromyini rodent group for aquatics. They feature a flattened head, partly webbed hind feet, and water-repellent fur that also offers insulation. Their waterproof thick coat varies from extremely dark fur, black to slate grey on their back, and white to orange underneath. The fur is moulted twice a year, becoming thicker in winter. The species has a blunt muzzle furnished with a dense set of long whiskers, small ears that can be folded flat against the head, and a white tail tip. Adult water-rats measure up to 35 centimetres in length from their nose to rump, with a slightly shorter tail. Adult males typically weigh 0.8 kilograms (up to 1.3 kg), while adult females weigh around 0.6 kilograms (up to 1.0 kg).
The breeding behaviours of the rakali are influenced by seasonal conditions. Under good seasonal conditions, the solitary water rat comes together with its mate and may produce several litters. They separate upon the birth of the young. The rakali constructs burrows dug into riverbanks but has also been documented building nests within sunken logs and reeds, in areas surrounded by roots and dense riparian vegetation for cover from predators. Females can reproduce from one year of age and mating commences from late winter to early spring, with a gestation period of 34 days.
The rakali is an opportunistic feeder, with a diet consisting primarily of fish, aquatic insects, crayfish, crabs, mussels, clams, and occasionally, frogs and turtles. They also feed on terrestrial prey, such as house mice, and will snack on pet food or picnic leftovers. Larger individuals are known to kill water birds, such as ducks and coots, and they are adept at killing the introduced cane toads found in Australia's tropical north.
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They are carnivorous and can eat up to one-third of their body weight
Otters are carnivorous mammals that have been on the planet for over 30 million years. They are a vulnerable species due to the increasing threat of habitat destruction, waterway pollution, and the fur trade. Otters have a high metabolic rate, which is important for generating body heat and requires them to consume a substantial amount of food.
Small-clawed otters, the smallest of the 13 otter species, have a big appetite to match their big personalities. They can eat up to one-third of their body weight every day. That's a lot of food! These otters are part of the Mustelid family, which also includes ferrets, weasels, badgers, skunks, and minks. They can be distinguished from other otter species by their small size and claws, which don't protrude beyond their fingers.
The small-clawed otter's sharp upper teeth enable them to feed on shelled animals like crabs and snails, and their streamlined bodies, with small heads, short legs, and flattened tails, help them move efficiently through the water. Their diet can include anything from fish to rodents, making them impressive hunters.
River otters typically consume 15% to 20% of their body weight daily, while sea otters eat around 25% to 30% of their weight. A large male sea otter may consume up to 11 kilograms (25 pounds) of food per day. River otters and giant otters use their vibrissae to detect prey movements in the water, and they catch their prey with their teeth. Giant otters often hold their prey in their paws while eating.
Whether it's a small-clawed otter in a zoo or a sea otter in the wild, these carnivorous mammals are fascinating creatures with a healthy appetite to match their active lifestyles.
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Frequently asked questions
Yes, otters are found in Australia. The small-clawed otter, the world's smallest of the 13 otter species, can be found at the Australia Zoo. The rakali, also known as the "water-rat", is another species of otter that is widely distributed throughout most of eastern Australia (including Tasmania), along the coast of northern Australia (except for the Pilbara), and South West WA.
Otters are carnivorous and eat a variety of aquatic animals, including fish, crustaceans, and shellfish. They also eat small birds, eggs, mammals, frogs, and reptiles. Otters can easily feed on shelled animals like crabs and snails with the help of their sharp upper teeth.
Yes, otters are a vulnerable species due to the increasing threats of habitat destruction, waterway pollution, and the fur trade.
