Not all forms of animal or insect life have red blood. A notable exception is the spider. Spiders have blood that appears to be a somewhat blue or blue-green variety. This is because the oxygen in a spider's bloodstream is not bound to hemoglobin, as is the case with humans. Instead, the oxygen is bound to hemocyanin, which contains copper rather than the iron that is found in hemoglobin. The result is a blood color that is blue rather than red.
More facts about animal blood:
Giraffes tend to have a long neck and legs. Physically, their heart is far from these organs. This might be the reason for the heart to work hard (increased pressure) so it can supply blood to those organs and especially to the head (a little one, which seems to have almost no brain). They might have evolved during an era where there was strong competition amongst the herbivores.
Has someone researched the intelligence of these animals, maybe in comparison to fellow herbivores like camels?