No. Tarantulas are arachnids, and arachnids are invertebrates. All mammals are vertebrates, and they all suckle their young on mothers' milk. read more
A tarantula’s blood is unique (not only by appearance); an oxygen-transporting protein is present (the copper-based hemocyanin), but not enclosed in blood cells such as the erythrocytes of mammals. A tarantula’s blood is not true blood, but rather a liquid called haemolymph, or hemolymph. read more