Damon Mcknight
Australia is known for its unique wildlife, with over 80% of its plants, mammals, reptiles and frogs found nowhere else in the world. One such creature is the rakali, a semi-aquatic native rodent found throughout most of eastern Australia, including Tasmania, and along the coast of northern Australia. The platypus is another semi-aquatic mammal native to eastern Australia, including Tasmania. With its duck-like bill, beaver-like tail, and otter-like feet, it is one of the most peculiar creatures in the world.
| Characteristics | Values |
|---|---|
| Name | Rakali, also known as the Australian Otter or Water-Rat |
| Scientific Name | Hydromys chrysogaster |
| Habitat | Freshwater streams, brackish wetlands, shallow lakes, farm dams, deep water storages, slow-moving rivers, creeks, estuaries, coastal lakes, sheltered marine bays |
| Diet | Aquatic insects, fish, crustaceans, mussels, snails, frogs, bird's eggs, small water birds, reptiles, mammals |
| Body Length | 23-37 cm |
| Weight | 340-1275 g |
| Tail Length | 24-35 cm |
| Behaviour | Nocturnal, semi-aquatic |
| Burrow Usage | Used in summer to escape the heat, and in winter to escape cold temperatures |
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What You'll Learn
The platypus is a semi-aquatic, egg-laying mammal
The platypus, or duck-billed platypus, is a semi-aquatic, egg-laying mammal native to eastern Australia, including Tasmania. Platypuses are one of the few venomous mammals, with males having venomous spurs on their back feet used in territorial disputes. Platypuses feed on aquatic vertebrates, which they detect in murky streams with the help of electroreceptors on their snouts. Platypuses are also known to glow in a bluish-green colour under a black light.
Platypuses are not the only semi-aquatic animals native to Australia. The rakali, or "Australian otter", is a semi-aquatic native rodent. They are found throughout most of eastern Australia, including Tasmania, and along the coast of northern Australia. They live in burrows on the banks of rivers, lakes, and estuaries and feed on aquatic insects, fish, crustaceans, mussels, snails, frogs, bird's eggs, and small water birds.
The platypus is a unique animal, with features from multiple other animals. It has a broad bill like a duck, a flat tail like a beaver, and webbed feet like an otter. When English naturalists first saw the preserved skin of a platypus in 1799, they believed it was a fake made from different animals sewn together.
Platypuses are monotremes, a type of egg-laying mammal. Monotremes do not have teats, instead excreting milk from many pores on the female's belly. Platypuses are one of five extant monotremes, the other four being species of echidna.
The platypus is a fascinating example of the unique wildlife found in Australia. Due to the country's isolation from other landmasses for about 30 million years, Australian animals have evolved in isolation from the rest of the world. This has resulted in a high percentage of Australia's plants, mammals, reptiles, and frogs being unique to the country.
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The rakali is a semi-aquatic rodent
The rakali, also known as the "Australian otter" or water-rat, is a semi-aquatic rodent native to Australia. It was first scientifically described in 1804 and is one of four species in the genus Hydromys, the only one with a range extending beyond New Guinea. The rakali has adapted to a semi-aquatic and nocturnal lifestyle, living in burrows on the banks of rivers, lakes, and estuaries. It has a body length of 23-37 cm, a thick tail measuring around 24-35 cm, and weighs between 340-1275 g.
The rakali is a carnivorous species, feeding on aquatic insects, fish, crustaceans, mussels, snails, frogs, bird's eggs, and small water birds. They prefer to live in freshwater streams, brackish wetlands, and shallow lakes, where they can easily find their prey. The rakali is a nocturnal animal, foraging for food at night and spending the day resting in their burrows. They are poor at regulating their body temperature and are vulnerable to extreme hot and cold temperatures.
The rakali is a unique species, as it is the only known semi-aquatic rodent native to Australia. They are found throughout most of eastern Australia, including Tasmania, and along the coast of northern Australia and South West WA. The rakali is an important part of the Australian ecosystem and plays a role in controlling the population of invasive species such as the cane toad.
The rakali is a fascinating example of Australian wildlife and its ability to adapt to a semi-aquatic lifestyle makes it a unique species among rodents. While it may resemble an otter or a water-rat, it is a distinct species with its own set of adaptations and behaviours. The rakali is a testament to the diversity and richness of Australia's native fauna.
The platypus is another example of a semi-aquatic animal native to Australia. It is an egg-laying mammal with a broad bill, a flat tail, and webbed feet. The platypus feeds on aquatic vertebrates and is known to be venomous, with males having venomous spurs on their back feet. The platypus and the rakali are both unique semi-aquatic species that have evolved and thrived in the diverse ecosystems of Australia.
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The Tasmanian devil is a carnivorous marsupial
The Tasmanian devil, or *Sarcophilus harrisii*, is a carnivorous marsupial native to the Australian island state of Tasmania. It is the largest surviving carnivorous marsupial in the world, filling the ecological niche of a scavenger that disposes of carrion. Tasmanian devils have a squat, muscular build, black fur, pungent odour, extremely loud and disturbing screeches, a keen sense of smell, and ferocity when feeding. They are characterised by their short muzzles and limbs, with forelegs that are slightly longer than their hind legs. Their large head and neck allow them to generate the strongest bite per unit body mass of any extant mammalian carnivore, with a Bite Force Quotient of 181 and a canine bite force of 553 N (124 lbf). This allows them to eat almost every part of their prey, including bones and fur.
Tasmanian devils are mainly scavengers, feeding on carcasses of dead animals, but they can also be effective predators. They hunt small mammals, birds, reptiles, amphibians, and insects, and in farming areas, they are known to feed on the carcasses of sheep and cattle. They are nocturnal, spending their nights roaming great distances in search of food. During the day, they hide in their dens or in dense bushland. Devils are not territorial, but they do maintain a home range that varies depending on food availability. They may travel up to 16 km or 10 miles each night in search of food.
Tasmanian devils are aggressive and are known for their noisy communal eating, during which they use noise and threatening physical displays to assert dominance within the pack. They are also distinctive for their peculiar gait. Their jaws and teeth resemble those of hyenas, an example of convergent evolution. Like all dasyurids, they have prominent canines and cheek teeth, with three pairs of lower incisors and four pairs of upper incisors located at the top front of the mouth. They have 42 teeth, which grow continuously throughout life at a slow rate.
Tasmanian devils are endangered, with a decline of more than 60% in the last 10 years due to threats such as attacks by domestic dogs and foxes, vehicle collisions, habitat loss, and disease. The Tasmanian wedge-tailed eagle is their largest predator in their ecosystem, competing for food with scavenging devils. However, their newest threat is Devil Facial Tumour Disease (DFTD), a rare, contagious cancer transmitted through biting that kills all infected devils within 6 to 12 months.
Tasmanian devils have a breeding season between March and May, with courtship rituals involving vocalisations and physical interactions. After mating, females have a short gestation period of about 21 days, resulting in the birth of very undeveloped young. A mother gives birth to a litter of about 50 tiny, pink, hairless babies called "imps". The imps must race to reach one of the mother's four teats, and only those that succeed will have a chance to grow and survive. The young are carried in a rear-facing pouch for about 4 months and are then left in a den until they are fully weaned at 5 to 6 months.
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The Fitzroy River Turtle is a freshwater bum-breather
The Fitzroy River Turtle, or Rheodytes leukops, is a unique species of freshwater turtle native to Australia. It is the only surviving member of the genus Rheodytes, the other being the extinct Rheodytes devisi. These turtles are found exclusively in the tributaries of the Fitzroy River in south-eastern Queensland. They are light to dark brown in colour and can grow up to 10 inches in length, with hatchlings barely bigger than a finger.
The Fitzroy River Turtle has gained fame as a "bum-breather," an unusual adaptation that allows it to breathe through its backside. This occurs through cloacal respiration, where the turtle takes breaths through gills located in its cloaca, a single opening under the tail used for waste and reproduction. This remarkable ability enables the turtle to remain underwater for extended periods, up to an incredible 21 days at a time.
As bottom feeders, their diet consists of terrestrial and aquatic insects, macroinvertebrates, crustaceans, algae, aquatic snails, worms, freshwater sponges, and aquatic plants such as ribbon weed. They prefer fast-flowing water near sandbanks for egg-laying and are often found in shallow waters, hidden by foliage or under logs. The female Fitzroy River Turtles have slightly shorter tails than their male counterparts, and they lay their eggs on steep, sandy banks.
Despite their fascinating characteristics, these turtles are listed as Vulnerable by the IUCN due to threats from predators like cats, foxes, pigs, and crocodiles, as well as human activities such as pollution and habitat destruction. Conservation efforts are underway to protect their nests and ensure the survival of this unique species.
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$22.76
The kangaroo is Australia's largest native terrestrial animal
There are different types of kangaroos, including the red kangaroo, which is the largest native terrestrial mammal in Australia. They are found in the arid interior of the country and have adapted to survive in the harsh desert environment. During hot summers, they seek shelter under shady trees, emerging to feed in the cooler evenings or after dark. After rainfall, they move to the woodlands, where they can find both food and shelter.
The kangaroo is a fascinating animal with powerful hind legs and a strong tail that helps it hop great heights and lengths. They can jump 30 feet long and 10 feet high in a single bound and can reach speeds of up to 40 miles per hour. Their large back feet also contribute to their impressive hopping abilities. Despite their iconic status, kangaroos are hunted for their meat and skins, which are exported worldwide.
Kangaroos are generally shy and retiring and rarely attack humans without provocation. However, they are known to collide with vehicles, as they are often dazzled by headlights or startled by engine noise. These collisions can be dangerous for both the kangaroos and the occupants of the vehicles.
In addition to their physical attributes, kangaroos have some interesting behavioural characteristics. They live in groups called "mobs" and communicate with humans, even when they are not domesticated. Kangaroos are an integral part of Australia's ecology and culture, and their protection is essential.
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Frequently asked questions
The platypus is a semi-aquatic animal native to eastern Australia, including Tasmania.
The platypus has a broad bill of a duck, a flat tail of a beaver, and the webbed feet of an otter.
Platypuses feed on aquatic vertebrates that they detect in murky streams with the help of electroreceptors on their snouts.
The rakali, also known as the "Australian otter" or water-rat, is a semi-aquatic native rodent found in eastern Australia, Tasmania, the coast of northern Australia, and South West WA.
Rakalis are carnivorous and feed on aquatic insects, fish, crustaceans, mussels, snails, frogs, bird's eggs, and small water birds.
