which animal have blue coloured blood ?

There are some creatures, however, for whom blue blood is the norm. Crustaceans, spiders, squid, octopuses, and some molluscs all have blue blood as a result of having a different respiratory pigment. Rather than haemoglobin, these creatures use a protein called haemocyanin to transport oxygen.

yaa right answer

Octopuses , Lobsters, Crabs.. have blue color blood.