Platypus
Weirdness 10/10

The animal that's venomous, lays eggs, and glows in the dark

This animal is venomous, lays eggs, and glows in the dark — and scientists thought it was a hoax.

📋 Fact File
🐾 Mammal🍽️ Carnivore
📏 Size
38-60 cm (15-24 in) long; 0.7-2.4 kg (1.5-5 lb)
About the size of a small house cat, with a duck-like bill
Lifespan
Up to about 15-20 years in the wild
🟡 Near ThreatenedPlatypuses are slowly declining as Australia's rivers dry up and get polluted.
🤔 Guess first

Which one is REALLY true about the Platypus?

The short version

ages 9–12

The platypus is one of only a few mammals that lay eggs. Males carry venomous spurs, it hunts with its eyes shut by sensing the electric fields of its prey through 40,000 receptors in its bill, it has no stomach, mothers sweat milk through their skin, and its fur glows blue-green under UV light.

📏 How big is it, really?
Platypus
60 cm
Platypus
a 7-year-old
1.2 m
🧒

You could line up about 2 of them along a 7-year-old!

Why it's so weird

  • The Platypus hunts with its eyes, ears, and nose shut, using 40,000 sensors in its bill to feel the electric pulses of its .
  • The Platypus is one of the only mammals that lays eggs instead of giving birth.
  • The Platypus carries sharp spurs on the back legs of males, strong enough to drop a dog.
  • The Platypus has no stomach at all, so food passes straight from gullet to gut.
  • The Platypus glows blue-green under ultraviolet light.

The full story

This animal is venomous, lays eggs, and glows in the dark — and scientists once thought it was a hoax. Meet the platypus, the strangest mammal on Earth. When the first one reached Britain, experts assumed somebody had stitched a duck bill onto a beaver. But it is completely real. It is one of the only mammals that lays eggs instead of giving birth. The males have sharp spurs on their back legs that deliver venom strong enough to drop a dog. It has no stomach at all, and the mothers have no nipples, so they literally sweat milk through their skin. And it hunts with its eyes, ears, and nose shut, using forty thousand sensors in its bill to feel the tiny electric pulses of its prey. Oh, and under ultraviolet light, its fur glows blue-green. Follow for more weird animal facts.

🔬 The science — how & why

When a shrimp or insect larva twitches its muscles underwater, those muscles make a tiny burst of electricity. The platypus closes its eyes, ears, and nose underwater, so instead it 'reads' those faint electric sparks with about 40,000 special sensors in its rubbery bill. Other sensors in the bill feel the ripples the prey makes in the water. Because electricity zips through water faster than ripples do, the electric signal arrives a split second sooner, and the platypus uses that tiny time gap to work out how far away its dinner is.

📚 Source: To Hunt, the Platypus Uses Its Electric Sixth Sense — American Museum of Natural History
🔎 How do we know?

Scientists confirmed it by recording the electrical responses of nerves in the platypus's bill in the lab, finding receptors that fire to weak electric fields, and by watching platypuses in tanks swing their bills toward a small hidden electric source (like a 1.5-volt battery) even though they couldn't see it.

📚 Source: Electroreceptors in the platypus (Scheich et al., 1986) — Nature / PubMed
Learn

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The Platypus hunts with its eyes, ears, and nose shut, using 40,000 sensors in its bill to feel the electric pulses of its prey.

The Platypus is a nocturnal bird from the forests of Central and South America.

The Platypus is one of the only mammals that lays eggs instead of giving birth.

🍎 Teacher or parent? Print a Platypus research worksheet or open the lesson hub.

Watch the 45-second version

Platypus gallery

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