Fact #3
May 22, 2026Octopuses Have Three Hearts and Blue Blood!
Octopuses are aliens from the ocean. They have 3 hearts and blue blood. They carry oxygen with copper instead of iron in their blood, turning blue when full.
Mini Facts
1
The main heart stops every time they swim. That's why they prefer crawling.
2
Each gill in an octopus has its own heart.
3
Octopuses are often said to have "9 brains!" In reality, there is one brain, and 8 arm nerve centers.