Linked from
The 13 pages that link to Tetrodotoxin, each with the reason it gives.
TetraodontiformesRelated: Some pufferfish accumulate this toxin, creating major food-safety risks.
FuguRelated: It is the toxin that makes some pufferfish organs hazardous to eat.
Rough-skinned newtRelated: The newt’s skin toxin disrupts nerve signaling in potential predators.
Eastern newtRelated: Eastern newts use this toxin as a defense against predators.