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Platypus (Ornithorhynchus anatinus) wildlife photograph

Field guide · rare

Platypus

Nature's mash-up, a duck-billed, egg-laying, venomous mammal that confounded scientists when first discovered.

Near Threatened

Ornithorhynchus anatinus

Overview

When European scientists first saw a platypus pelt, they assumed it was a hoax, a beaver tail sewn to a duck bill. In fact, the platypus is one of only five monotreme mammals, laying eggs and nursing young with milk despite being classified as a mammal.

Platypuses hunt underwater with eyes and ears closed, detecting prey through electroreceptors in their bill, sensing the tiny electrical signals from shrimp and insect larvae in stream mud. Males have venomous spurs on their hind legs.

Habitat

  • Rivers
  • Streams
  • Freshwater lakes

Freshwater streams, rivers, and lakes in eastern Australia and Tasmania hold platypuses. They need healthy banks for burrowing and unpolluted water with abundant invertebrate prey, and are most active at dawn and dusk.

Countries found

Field notes

Field scale for the Platypus: length around 40-60 cm; weight 0.8-2.4 kg. Typical lifespan: Around 10-15 years in the wild.

When you are scanning habitat, prioritise rivers, streams, and freshwater lakes. Those settings are where a clean look and a usable photo are most likely.

Quick ID anchor: Duck-like bill, waterproof brown fur, webbed feet, and a flat beaver-like tail. Confirm with behaviour and habitat before you log the discovery.

Diet

Feeds underwater on insect larvae, freshwater shrimp, worms, and other benthic invertebrates detected by electroreception.

Stores prey in cheek pouches, then surfaces to chew.

Behaviour

Mostly crepuscular and nocturnal; closes eyes and ears while diving and relies on the bill's sensors.

Males have venomous hind-leg spurs used in competition; females lay eggs in riverside burrows.

How to identify

Duck-like bill, waterproof brown fur, webbed feet, and a flat beaver-like tail.

Unmistakable among Australian mammals; no similar wild species shares this body plan.

Interesting facts

  1. 01

    Platypuses are one of only two egg-laying mammals, and males have venomous spurs.

  2. 02

    They detect prey using electroreception, sensing electrical signals in the water.

  3. 03

    Early scientists thought the first specimens were elaborate fakes.

Conservation status

NT: Near Threatened

Platypuses are Near Threatened, declining from drought, habitat loss, and entanglement in fishing gear. Eastern Australian populations have fallen sharply in recent decades.

Sources: IUCN Red List

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Where it lives

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