AnimalsMarine Life
Horseshoe crab blood clots on contact with bacterial toxins, so it has been used for decades to check that vaccines and implants are sterile.
The animals are bled and returned to the sea.
Source
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More animal facts
Animal facts are the ones people repeat at dinner. Sharks are older than trees, a headless chicken lived for eighteen months, and vampire bats remember who fed them. Every fact here links to the reference it came from.
- Sharks are older than trees.
- The oldest animal ever found was 507. We froze it.
- A mantis shrimp's strike is fast enough to boil the water behind it into a vapour bubble.
- One jellyfish can age backwards. Indefinitely.
- A Greenland shark isn't ready to breed until about 150.
- A headless chicken lived for 18 months.