Sure,we all know folks we consider toxic but scientists have been researching how animals become toxic and have found that any animal with salivary glands has the potential to become toxic. Most of the genes and molecular mechanisms are already in place but have only become active when a mammal needs the poison to survive like shrews use it to escape their predators and several other mammals use venom as either a defense or an aid to enable them to kill their prey. Whether or not humans will develop a venom system remains to be seen by what our future holds.
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