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Echidna

life science Maturity 7-9 Next article →

Echidnas are unique mammals belonging to the family Tachyglossidae. They are known as monotremes, which are mammals that lay eggs instead of giving birth to live young.

Echidna, Exmouth
Echidna, Exmouth

Along with the platypus, they are the only living members of the order Monotremata. These animals are found in Australia and New Guinea. They are often called spiny anteaters due to their physical appearance. This name describes their coarse hair and protective spines.

Onkapringa River NP echidna spines P1000601
Onkapringa River NP echidna spines P1000601

Their bodies are covered in spines made of keratin. Keratin is the same fibrous protein found in animal claws, nails, and fur. Echidnas are solitary animals that live in various habitats. They can live in forests, woodlands, or even deserts.

To find food, the echidna relies on a specialized snout called a proboscis. This organ functions as both a nose and a mouth.

Echidna skeleton
Echidna skeleton

Many species use electrosensors to locate prey like ants, termites, or earthworms. These sensors detect tiny electrical signals from living things. The long-beaked echidna has approximately 2,000 of these sensors. In contrast, the short-beaked echidna has no more than 400 at the tip of its snout. Because they lack teeth, echidnas must process food differently. They use long, sticky tongues to lick up prey. They then grind the food between the bottom of their mouths and their tongues.

There are four living species of echidna divided into two main groups. The genus Zaglossus includes three species found in New Guinea.

Long-beakedEchidna
Long-beakedEchidna

The Western long-beaked echidna lives in highland forests. Sir David's long-beaked echidna lives in even higher habitats. The Eastern long-beaked echidna is the third species in this group. The fourth species is the short-beaked echidna, which belongs to the genus Tachyglossus.

EchidnainCanberra
EchidnainCanberra

This species lives in Australia and can survive in many environments. It can inhabit everything from the snowy Australian Alps to the dry Outback. The short-beaked echidna is generally smaller and has longer hair than the Zaglossus species.

Scientists believe echidnas evolved between 20 and 50 million years ago. They likely descended from an amphibious, platypus-like ancestor.

Echidna skeleton
Echidna skeleton

This ancestor likely foraged in the water before moving to land. This transition meant echidnas had to compete with marsupials for resources. Some researchers suggest they may have originally evolved in New Guinea. This would explain why they are so abundant there today. The loss of teeth in monotremes happened before the echidna and platypus split. This is evidenced by the fact that both groups lost the same four genes involved in tooth development.

Echidnas have several interesting biological traits and measurements. A fully grown female weighs about 3 kg, while males are 33% larger at about 4 kg.

Their body temperature is about 33 °C (91.4 °F). This is the second-lowest active body temperature of all mammals. In the wild, they typically live for 14 to 16 years. However, they are long-lived for their size due to a low metabolism. A captive echidna has lived for 50 years. Some wild individuals have been reported to reach 45 years of age.

Reproduction in echidnas follows a specific process. A female mates and then lays a single soft, leathery egg 22 days later.

Echidna, Exmouth
Echidna, Exmouth

She deposits the egg, which is about 15 mm long, directly into her pouch. After 10 days of gestation, the baby, called a puggle, hatches. The puggle uses a reptile-like egg tooth to break the shell. It lacks teats and must suck milk from two milk patches on the mother. The puggle stays in the pouch for 45 to 55 days. At this point, the young echidna begins to develop its spines.

Echidnas are part of a complex biological system involving unique evolutionary paths. Their brain structure is different from humans, with the neocortex making up only half of the brain. They also show interesting sleep patterns. An echidna only enters REM sleep when the temperature is around 25 °C (77 °F). If the temperature is 15 °C or 28 °C, REM sleep is suppressed. Their survival depends on finding shelter in caves, rock crevices, or animal burrows. They must also avoid predators like feral cats, foxes, and snakes. Protecting their habitat helps ensure these unique mammals continue to thrive.

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🖼️ Images & Media (6)
File:Onkapringa River NP echidna spines P1000601.jpg
Onkapringa River NP echidna spines P1000601.jpg
French Island Echidna.ogg
File:Echidna skeleton.jpg
Echidna skeleton.jpg
File:Long-beakedEchidna.jpg
Long-beakedEchidna.jpg
File:EchidnainCanberra.JPG
EchidnainCanberra.JPG
File:Echidna, Exmouth.jpg
Echidna, Exmouth.jpg
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