in taxon Arthropoda Actinopterygii Salamandridae Ornithorhynchus Homo sapiens secretion of exocrine gland venom Wikipedia:Venom MESH:D014688 Poisonous animal secretions forming fluid mixtures of many different enzymes, toxins, and other substances. These substances are produced in specialized glands and secreted through specialized delivery systems (nematocysts, spines, fangs, etc.) for disabling prey or predator. BTO:0001439 UBERON:0007113 zootoxin Note we include a separate class for snake venom