Horseshoe crab is very important for the biomedical industry as it is unique and the blood color is blue . Horseshoe crab’s blood is blue in color due to the presence of copper . It consists of amebocyte which can be used in the field of biomedics to identify the contamination of vaccines and in all the injectable drugs . The special amebocyte which can be found in horseshoe crab blood can be used in FDA testing . It is used to collect the blood of an animal.