banned for post number 33138
and if you change an insect's diet, the color of the blood changes.
edit: still banned cause your argument hinged on copper. FAIL
banned for making me look this up
COPPER
Horseshoe crab blood contains hemocyanin (a molecule based on copper), which gives it a blue tinge. The copper-containing pigment hemocyanin, second in breadth of distribution after hemoglobin, occurs in the blood of various molluscs and arthropods. Unlike human blood, which is bright red when ox ygenated in the arteries and dark red when deoxygenated in the veins, hemocyanin blood is a beautiful blue in the arteries and as clear and colorless as water in the veins. Hemocyanin is always found roaming free in blood plasma, instead of confined within corpuscles as are the relatively smaller molecules of Hb. This copper-based, proteinous, non-porphyrin blood pigment is only about one-quarter as efficient as hemoglobin at carrying oxygen.
http://www.naturesmell.com/are-there-animals-with-copper-and-vanadium-based-blood/
and yes blood suckers will have red blood for a little bit. but that is your blood not theirs