Hooded Seal
Weirdness 9/10

The seal that inflates a bright red balloon out of one nostril

This seal attracts mates by blowing a bright red balloon out of one nostril.

📋 Fact File
🐾 Mammal🍽️ Carnivore (fish and squid)
📏 Size
Males about 2.5-2.6 m (8.5 ft) long and up to about 350 kg
Longer than your bed — and as heavy as four grown-ups
Lifespan
Up to about 35 years
🟡 VulnerableThe Greenland Sea population has shrunk, and melting sea ice is a growing worry for this ice-breeding seal.
🤔 Guess first

Which one is REALLY true about the Hooded Seal?

The short version

Male hooded seals have two bizarre display organs: a black inflatable hood (an enlarged nasal cavity) that balloons over the face, and a glossy pink-red membrane pushed out through one nostril and inflated, then shaken at rivals and females. Their pups also nurse for only about four days — the shortest nursing period of any mammal.

Why it's so weird

  • The Hooded Seal pushes part of the lining of its nose out through one nostril and blows it up into a glossy pink and red bubble.
  • The Hooded Seal waves that red bubble around and shakes it at rival males and at females.
  • The Hooded Seal inflates a second display organ too, a black stretchy hood that balloons over its face like a lumpy beret.
  • The Hooded Seal grows both of those bizarre display organs only in adult males.
  • The Hooded Seal feeds its pups milk for only about four days, the shortest nursing period of any mammal on Earth.
📏 How big is it, really?
Hooded Seal
2.5 m
Hooded Seal
a 7-year-old
1.2 m
🧒

The Hooded Seal is about 2.1× as long as a 7-year-old! 🤯