evidence: Do Vegans Who Get a COVID-19 Vaccine Abandon Their Moral Principles? Yes — and No. Although the vaccines for COVID-19 that are presently available are being represented as having no animal ingredients, the blood of many thousands of horseshoe crabs is being used to make sure that the vaccines are free of contamination. Although the crab blood is technically not an ingredient of the vaccine, it might as well be. Horseshoe crabs are not really crabs; they are more closely related to spiders and other arachnids than they are to crabs or lobsters. But horseshoe crabs have a complex nervous system and it is very likely that they are sentient, or subjectively aware and able to experience pain. The crabs are captured, placed in racks, and have the tissue around their hearts pierced. Up to 30% of their blood (which is blue) is drained. The process is certainly distressing to the crabs. Although they are returned to the ocean, between 10% and 30% of the crabs die in the bleeding process and after they are returned. Many are re-caught and bled again. Although there is a non-animal alternative to using crab’s blood, that alternative has not been accepted and will not be employed with respect to the COVID-19 vaccines.