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This is caused by their diet in the wild. They eat other poisonous insects which can then be transferred to the frogs skin and become poisonous.
To simply protect itself against predators.
the skin of this species contains less batrachotoxin than the similar golden poison frog P. terribilis. Batrachotoxin is a steroidal alkaloid secreted from skin glands and is deadly to other small animals. It blocks neuromuscular transmission, resulting in muscle and respiratory paralysis and death. Extrapolating from the lethal dosage (LD) in rats, approximately 136 micrograms of this alkaloid is the lethal dosage for a 150 pound (68 kilogram) person. This minute amount is roughly equivalent to the weight of two or three grains of ordinary table salt (NaCl).

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Q: Why are poison dart frogs poisonous?
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