When you think of blood, the first colour that probably comes to mind is red. That’s true for most animals, including humans.
But there are a few creatures out there that break this rule completely– they bleed blue!
And no, it’s not science fiction. These animals genuinely have blue-coloured blood flowing through their bodies.
The reason behind this lies in a different oxygen-carrying protein called hemocyanin, which uses copper instead of iron (like in our haemoglobin).
Let’s take a closer look at some fascinating animals that literally have blue blood.
