Hornbill
Weirdness 8/10

The bird that seals its own mate inside a tree for months

This bird locks its own mate inside a tree for months, sealed behind a wall of mud.

📋 Fact File
🐾 Bird🍽️ Omnivore (mostly figs and fruit, plus small animals)
📏 Size
Great hornbill: about 95-120 cm (3-4 ft) long
Almost as long as a baseball bat
Lifespan
Up to about 50 years in zoos (35-40 in the wild)
🟡 VulnerableThe great hornbill is Vulnerable: its forests are being cut down and it is hunted for its casque.
🤔 Guess first

Which one is REALLY true about the Hornbill?

The short version

The hornbill has a huge hollow casque on its beak and a bizarre nesting habit: the female squeezes into a tree hole and the pair wall her in with mud and droppings, leaving only a slit. She stays sealed inside for months while the male feeds her through the gap, keeping eggs and chicks safe from snakes and monkeys.

Why it's so weird

  • The Hornbill carries a huge hollow casque on top of its beak.
  • The Hornbill walls the female into a tree hole with mud, droppings and fruit after she has squeezed inside herself, leaving only a narrow slit.
  • The Hornbill leaves her sealed in that chamber for months, completely dependent on the male, who passes food through the gap.
  • The Hornbill uses that mud wall to keep the eggs and chicks safe from snakes and hungry monkeys.
  • The Hornbill breaks the wall down from the inside when the young are finally ready to step out into the world.
📏 How big is it, really?
Hornbill
1.1 m
Hornbill
a 7-year-old
1.2 m
🧒

The Hornbill is about the same length as a 7-year-old.