![iguana, reptile](https://assets.shortpedia.com/uploads/2022/11/30/1669801028.webp?tr=w-1200,h-600,cm-pad_resize,bg-F3F3F3)
Iguanas do have blood. Because of the presence of biliverdin, a consequence of hemoglobin breakdown, their blood is often greenish in hue. Iguanas have a renal portal blood system, which filters blood from the rear limbs before it enters the main circulation.