Why do different animals have different blood colors? If red blood is caused by Red Blood Cells, do crabs have “Blue Blood Cells”?

Question

Why do different animals have different blood colors? If red blood is caused by Red Blood Cells, do crabs have “Blue Blood Cells”?

In: Biology

Answer 1

Horseshoe crabs use hemocyanin the key atoms are copper atoms not iron like in Haemoglobin and myoglobin in most red blooded mammals. https://youtu.be/t6kQhilO04c