Also they miss mentioning https://en.m.wikipedia.org/wiki/Erythrocruorin https://en.m.wikipedia.org/wiki/Erythrocruorin which is green, but for a different reas

Also they miss mentioning https://en.m.wikipedia.org/wiki/Erythrocruorin https://en.m.wikipedia.org/wiki/Erythrocruorin which is green, but for a different reason than biliverdin in lizards. Seems it has chlorocruorin in which looks very much like a 'normal' haem (i can't spot the difference off hand). edit: Ok, from Figure 2 here : https://biomolecules101.wordpress.com/2020/01/17/oxygen-transport-proteins-the-colors-of-blood/ https://biomolecules101.wordpress.com/2020/01/17/oxygen-tran... looks like normal heme ('heme b') has an ethenyl group while chlorocruorin has an aldehyde there