Three reasons:
* The poison/venom is contained (generated in its own self contained gland separated from the rest of the body)
* The poison/venom is generated on demand (e.g. created from different components that are combined when neeed)
* It has a natural immunity to it. Either it contains the proper chemical or enzyme that can break down the poison/venom or it lacks the biological component that the poison/venom interacts with to cause its debilitating effects.
Hi! for e.g., a snake venom mixture generally composed of amino acids proteins and peptides. this mixture itself is not harmful to the snake even if the snake ingested its venom, because it just get digested into smaller chemical structure which render it harmless.
snake venom is only harmful if it entered its prey’s bloodstream & tissues. & it can be harmful to the snake itself if it bite into into its own flesh & bloodstream, ejecting together the venom from its fang.
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