Octopuses have blue blood, three hearts and a doughnut-shaped brain. But these aren’t even the most unusual things about them! Known for their otherworldly look and remarkable intelligence, octopuses ...

The small blue ring octopus is extremely venomous, with toxin 1,200 times more powerful than cyanide. Its bite can swiftly paralyze, potentially leading to death within 20 minutes. There is no ...