شیمی خون نشان می دهد که چرا برخی از حیوانات به رنگ آبی، سبز یا بنفش خونریزی می کنند

Blood chemistry reveals why some animals bleed blue, green or purple

Whether it's gushing from a bumped nose or pooling atop a pricked finger, our blood is some hue of red. But red-bloodedness isn't universal in the animal kingdom. In some creatures, the vital fluid is purple; in others it's yellow, green or even white.