The term "poison dart frog" isn't the name of a single toxic species but rather a common designation for all toxic frogs, primarily those colorful and highly poisonous frogs found in the Amazon rainforest. And this is where the problem lies.
Not all poison frogs carry lethal toxicity, and the source of their toxicity varies. Some poison frogs produce their own toxins, while others accumulate toxins from eating toxic insects. After ingesting these insects, they store the toxins within their bodies and transform them into defensive weapons. As a result, some poison dart frogs raised by humans are entirely non-toxic.
Due to the unreliable nature of poison dart frog toxins, sometimes only a minute amount is required to swiftly kill prey. Other times, despite being struck by the poisoned arrow, the prey may suffer no harm.