The Australian bandicoot is a marsupial that defies the standard rules of its kind.

Nature · Published 3 October 2026 Swipe more like this →

In short: While most marsupials rely solely on a yolk-sac placenta, bandicoots possess a unique, transitory placenta that bridges the gap toward placental mammals. These small, omnivorous creatures are not the rodents their name suggests, but rather specialized marsupials that have evolved to thrive in the diverse environments of Australia and New Guinea.

Bandicoots belong to the order Peramelemorphia, a group comprising about 20 species of Australasian marsupials. Their physical stature is modest, ranging from 30 to 80 cm in total length, including their tails. Unlike the majority of their marsupial relatives, bandicoots exhibit a fascinating biological anomaly: they develop a transitory placenta during gestation. While this structure lacks the villi found in the placentas of eutherian mammals, it represents a distinct departure from the typical marsupial reproductive strategy.

The name bandicoot is a historical misnomer. It was originally applied by early settlers to unrelated, large rat species in India, derived from the Telugu term for 'pig-rat.' True bandicoots are endemic to the Australia-New Guinea region and are entirely distinct from these rodents. They occupy varied niches, often maintaining a mixed diet of plants and insects, which allows them to survive in environments ranging from grasslands to drylands.

Beyond their reproductive quirks, bandicoots are well-adapted to their surroundings. They are primarily nocturnal and possess sharp claws and sensitive snouts, which they use as fossorial diggers to forage for food and create shelter. Their physiology is finely tuned for survival in hot, dry climates, supported by low basal metabolic rates and effective cooling mechanisms. Despite their evolutionary success, they remain part of the broader marsupial group, sharing the characteristic pouch and the tendency for young to complete their development while attached to the mother's teats.

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