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Christmas Island Crab Trivia Questions

How much do you really know about Christmas Island Crab? Below are 8 true or false statements. Click each one to reveal the answer and explanation.

1.

Christmas Island crabs are found only on Christmas Island in the Indian Ocean.

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Easy
✗ FALSE

They are endemic to Christmas Island and the nearby Cocos (Keeling) Islands, but the vast majority live on Christmas Island.

2.

Yellow crazy ants pose a major threat to Christmas Island crabs by spraying formic acid.

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Medium
✓ TRUE

Invasive yellow crazy ants blind and kill crabs with formic acid sprays, devastating local populations.

3.

Christmas Island crabs migrate to the ocean by the millions each year to breed.

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Medium
✓ TRUE

Over 50 million red crabs migrate annually from forest to coast for spawning, timed with the wet season's first rains.

4.

Christmas Island crabs are the only land crabs that can breathe underwater indefinitely.

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Medium
✗ FALSE

They cannot breathe underwater; they hold air in their gill chambers and must return to land or drown.

5.

Every year, millions of Christmas Island crabs migrate from the forest to the coast to breed.

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Hard
✓ TRUE

The Christmas Island red crab's annual mass migration to the sea is a famous natural event, with an estimated 40-50 million crabs moving across the island to release eggs into the ocean.

6.

The migration of Christmas Island red crabs is triggered by a drop in atmospheric pressure from an approaching cyclone.

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Hard
✗ FALSE

Migration is triggered by the onset of the wet season's first rains, not by pressure changes alone. Cyclones can disrupt it.

7.

Christmas Island crabs can regrow lost claws and legs within a single molting cycle.

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Hard
✗ FALSE

Regeneration takes multiple molts over months to years; a single molt only produces a small, non-functional limb bud.

8.

The crabs' bright red color comes from a pigment that also protects them from UV radiation.

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Hard
✓ TRUE

The red pigment astaxanthin, a carotenoid, provides both coloration and UV protection, acting as a natural sunscreen during their migration.

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