What substance, containing copper, gives slug blood its distinctive pale blue or grey color?

Answer

Hemocyanin

Slugs use hemocyanin, a molecule based on copper, to transport oxygen, which results in their blood (haemolymph) appearing blue or grey, unlike the iron-based red blood of humans.

What substance, containing copper, gives slug blood its distinctive pale blue or grey color?

#Videos

Slugs (10 FACTS You NEVER KNEW) - YouTube

animaltriviafactslug