Platypus
Platypus Facts
| Size | 12-16 inches (30-40 cm) |
| Speed | Up to 22 mph (35 km/h) |
| Weight | 1.1-5.5 pounds (0.5-2.5 kg) |
| Lifespan | 10 years |
| Food | Insects, snails, crabs |
| Predators | Foxes, snakes, crocodiles |
| Habitat | Eastern Australia, Tasmania |
| Order | Monotremes |
| Family | Ornithorhynchidae |
| Scientific name | Ornithorhynchus anatinus |
| Characteristics | Egg-laying mammal with a "duck bill" |
Main Characteristics
Platypuses are egg-laying mammals that inhabit Australia. They possess a broad bill, a paddle-shaped tail, webbed feet, claws, and dense fur. This unique combination gives them an appearance reminiscent of a duck, beaver, bear, otter, and frog.The platypus is one of the five venomous mammals in the world.
Animal Order
Platypus animals are classified as "monotremes" because their reproductive and excretory organs open into the same orifice (known as the cloaca). There are only five species of monotremes: the platypus and four species of echidnas.
Species
The platypus is one of the most peculiar creatures in the world. It appears to be a combination of various animals. Externally, it resembles the following:
- Duck - due to its bill
- Beaver - because of its paddle-shaped tail and webbed feet
- Bear - since it has claws
- Otter - for its this fur
- Frog - as it has webbings between its toes
Even the genetic makeup is a mix! In 2021, scientists from the University of Copenhagen discovered that platypuses not only appear to be a blend of several animals, but they actually are. According to their genetic material, they are both mammals and birds, as well as reptiles. This is why they are referred to as a "bridge animal," meaning an animal that exhibits characteristics from various animal classes.
Evolution
A Fake?
Initially, the platypus was thought to be a "fake", with the belief that a duck's bill had been sewn onto a beaver's body. The renowned naturalist Charles Darwin was also quite astonished when he encountered this remarkable creature in 1836. He noted in his journal: “A disbeliever in anything beyond his own reason, might exclaim: Surely two distinct creators must have been at work”.
Living Fossils
Platypuses are often referred to as "living fossils". This term is used because they have undergone very little change over an extensive period. Their ancestors existed over 200 million years ago, and they looked just like they do now even 100,000 years ago - perhaps even longer.
Distribution and Habitat
Platypuses are found exclusively in Australia. They are widespread across the entire country, from the far north to the island of Tasmania in the south. Their habitat includes shallow lakes, ponds, and rivers. They are so well adapted to aquatic life that they can be described as semi-amphibious. They prefer stable banks that are anchored by the roots of native plants. Different climate zones do not pose a problem for them. They thrive in both humid tropical rainforests and cool mountainous regions.
Lifestyle
Platypuses are solitary creatures. They are active at night. As soon as dusk falls, they leave their burrow in search of food. During the day, they rest in caves that they dig beneath the riverbank.
Anatomy and Appearance
Size and Weight
Platypuses have a body length of 12-16 inches (30-40 cm). Their tails measure 4-6 inches (10-15 cm). They weigh 1.1-5.5 pounds (0.5-2.5 kg), with males being 30 to 40% larger and heavier than females.
Bill
The platypus features a very large, broad bill that resembles a duck's bill. However, unlike a duck's, it is quite soft and flexible. The surface has a texture similar to leather.
Fur
The platypus has dark brown, waterproof fur. The underfur is made up of many short hairs that trap small air bubbles underwater. These bubbles keep the animal warm in cold water, much like bubble wrap. The long guard hairs provide protection against injuries.
Claws
Their hands have strong claws that they use for digging.
Webbing
Webbing is present between their fingers and toes, aiding the platypus in swimming.
Venomous Spur
Males have a venomous spur on both of their hind legs.
Scent Glands
Scent glands are located on both sides of the neck. During mating season, they emit a musky scent. To attract females, the animals rub their scent glands against tree trunks or other objects.
Shoulder Bones
Unlike other mammals, platypuses possess an extra bone in their shoulder girdle, which makes the shoulder blade rigid and inflexible. This provides an advantage: it allows them to swim and dig more effectively.
Cheek Pouches
Platypuses store their prey in cheek pouches.
Tail
Platypuses have a thick, paddle-shaped tail that resembles a beaver's tail. It provides greater stability while swimming. Additionally, they store extra fat in it.
Adaptation to the Habitat
- Waterproof fur – to keep them warm in the water
- Claws – for digging burrows Scent glands – to find partners
- Tail – to maintain direction in the water
- Webbed feet – to swim more effectively
- Extra shoulder bones – to enhance swimming and digging abilities
Diet
Platypuses are carnivores. They feed on larvae, crustaceans, snails, tadpoles, worms, and small fish. They require about 20% of their body weight in food each day. This process can take up to 12 hours.
Behavior
Hunting
The platypus primarily inhabits streams and rivers, where it forages for food in murky waters. Since it is nearly blind and deaf, it has developed a unique strategy to locate its prey. It closes its eyes, ears, and nostrils and relies entirely on its sensitive bill. Through this bill, it detects electrical signals from other animals, much like an antenna. These signals are generated by muscle contractions, for instance, when an animal is startled and attempts to flee. For this reason, the platypus constantly moves its bill back and forth to accurately pinpoint the source of the signals.
Feeding
When platypuses catch something, they first store it in their cheek pouches. At the water's surface, they then begin to eat. Since they lack teeth, they grind their food using their beaks. They are assisted by two ridged horn plates that run along the sides of their upper and lower jaws. Additionally, they take small pebbles into their mouths to help grind the food. Indigestible shells and exoskeletons are spat out.
Communication
Platypuses communicate through sounds. With their vocal cords, they can produce noises such as an angry growl, a funny honk, high-pitched whistles, or squeaks.
Burrows
Platypuses create burrows to rest and raise their young. A typical burrow is about 16 feet (5 meters) long. Nesting burrows can even reach up to 98 feet (30 meters) in length and contain several chambers.
Large Territory
Male platypuses have a large territory. They can travel up to 9 miles (15 km) away from their burrow. In a single day, they can cover up to 6 miles (10 km). Female platypuses usually stay within 2.7 miles (4.5 km) of their home.
Senses and Abilities
Low Body Temperature
The average body temperature of a platypus is quite low, around 89.6 degrees Fahrenheit (32 degrees Celsius). In contrast, most other mammals have a body temperature of about 98.6 degrees Fahrenheit (37 degrees Celsius). Fortunately, their fur is very warm, allowing them to maintain their body temperature even in cold water.
Swimming
Platypuses are excellent swimmers, being both fast and agile. Before entering the water, they close their eyes, ears, and nostrils. Using their front feet, they propel themselves underwater like a propeller. Their back feet are used for braking and steering. The tail does not function as a rudder and does not assist in steering; however, it helps keep their body well-positioned in the water for stable swimming. This is unique in the animal kingdom, as typically, the back feet are used for propulsion while the tail is used for steering.
Diving
Platypuses usually dive to a depth of 5 meters and can stay underwater for 30 to 60 seconds. When they have plenty of air and energy, they can dive as deep as 26 feet (8 meters) and remain submerged for up to 2 minutes.
Running
The platypus isn't very good at running and tends to move rather clumsily. With its legs positioned on the sides of its body (instead of underneath), it has a reptilian-like gait.
Electroreception
For the platypus, electroreception is the most crucial sense. Their sensitive bill contains over 40,000 electroreceptors. These are cells that detect electrical voltages and fields from other animals. While hunting, they constantly move their heads back and forth – much like an antenna. With their bill, they can sense the slightest touches, tiny sound waves, and minute pressure changes in the water.
Sleep
Platypuses sleep for up to 14 hours each day. They spend more than 8 hours, or about 60% of the time, in the REM sleep phase. This is a particularly deep sleep often accompanied by vivid dreams. In humans, REM sleep typically accounts for only 20-25% of total sleep time. REM stands for "Rapid Eye Movement" and translates to "Schnelle Augenbewegung" in German. This phase is named so because the eyes move rapidly back and forth under the closed eyelids.
Glowing Fur under UV Light
The platypus is the first known mammal whose fur glows under UV light. It shimmers in green and blue. Researchers believe this trait may assist in communication with fellow platypuses – after all, they don't have a strong sense of sight.
Are Platypuses Dangerous?
Platypuses have a venomous spur on each of their hind legs. When the spur penetrates the skin, a toxic fluid flows through it into the wound, originating from a venom gland. Although platypuses are generally shy and harmless, they may sting if they feel threatened or are accidentally startled. The venom is not lethal to humans, but it can cause pain that may last for months (!). In contrast, dogs are at a higher risk, as the amount of venom can be fatal to them. Interestingly, this does not apply to cats, which are less sensitive to the venom.
Life Expectancy
In the wild, platypuses typically live around 10 years, but they can reach 17 years or more in captivity.
Enemies and Threats
Natural Enemies
The natural predators of the platypus include owls, eagles, falcons, dingoes, Tasmanian devils, monitor lizards, snakes, water rats, domestic dogs, house cats, and foxes.
Human Impact
Hunting
The platypus has very soft, dense fur that was highly sought after in the 18th and 19th centuries. It was hunted nearly to extinction and faced the threat of disappearing altogether. Fortunately, hunting was banned, allowing the population to recover.
Habitat Loss
The platypus has adapted remarkably to the unique conditions of its habitat. Even the slightest changes can jeopardize its survival. Access to water and water quality are significant issues. Its habitat is shrinking due to deforestation and urban development. Dams cause rivers and lakes to have reduced water flow, leading to drying out during particularly hot periods.
Litter
Platypuses can easily get caught in litter, fishing lines, and nets. Even seemingly harmless items like rubber bands, plastic rings, and hair ties can be fatal if they become entangled. They can no longer swim and may drown because they cannot breathe underwater.
Traps
'Yabby traps' pose another threat to these animals. These are open mesh baskets used for catching Australian yabbies. Unfortunately, platypuses and other creatures (like turtles) can also get trapped in them. They cannot escape and drown in a tragic manner.
Conservation Status
Currently, platypuses are not considered endangered, but they are close to that status. According to an estimate by the IUCN, there are still between 30,000 and 300,000 individuals left.
Importance for the Ecosystem
Platypuses play a crucial role in their habitat. They help maintain the balance of invertebrate populations.
Reproduction
Mating Season
Platypuses mate during the Australian winter and into spring, from July to October. It is said that the males compete for the females, using their venomous spurs to assert dominance. When a female allows herself to be grabbed by the male's tail, they swim in circles together and mate.
Gestation Period
After a gestation period of 2-3 weeks, the female platypus lays 1-3 small eggs. These eggs measure only 0.60-0.66 inches (1.5-1.7 cm) in size and have a soft shell. They are incubated for about 10 days before the young hatch. At birth, the young are just 0.4 inches (1 cm) long, blind, and hairless. They are raised in a burrow lined with soft vegetation.
Nursing
Typically, mammal babies suckle from their mother's nipples to drink milk. However, platypuses do not have nipples. Instead, they have mammary glands that are actually modified sweat glands. They essentially 'sweat' the milk for their young, who simply lick it off their mother's fur. After 3-5 months, the babies leave the burrow for the first time. They reach adulthood after 12-18 months.
Monotremes
Unlike other mammals, they do not have a birth canal. Instead, their eggs pass through the same opening as urine and feces, ending in a single body opening known as the cloaca. This feature is shared by cloacal animals, including birds and reptiles.
The Platypus Is Related To:
- Echidna
Animals in the Same Biome:
Sources:
- „The Platypus, Part 2“ (https://hoasrc.com)
- „The Platypus – A Very Special Australian“ (https://platypus.asn.au)
- „Platypus“ (https://www.iucnredlist.org)
- „Lightest egg-laying mammal“ (https://www.guinnessworldrecords.com)
- „Most REM sleep for a mammal“ (https://www.guinnessworldrecords.com)
- „First biofluorescent egg-laying mammal“ (https://www.guinnessworldrecords.com)
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