Batrachotoxins are extremely potent cardiotoxic and neurotoxic steroidal alkaloids found in certain species of frogs (poison dart frog

Poison dart frog

Poison dart frog is the common name of a group of frogs in the family Dendrobatidae which are native to Central and South America. These species are diurnal and often have brightly-colored bodies...

), melyrid

Melyridae

Melyridae are a family of beetles of the superfamily Cleroidea. The family Melyridae contains 520 species in 58 genera in North America. Most are elongate-oval, soft-bodied beetles 10 mm long or less. Many are brightly colored with brown or red and black...

 beetles, and birds (Pitohui

Pitohui

The pitohuis are a genus of birds endemic to New Guinea, belonging to the family Pachycephalidae.Currently six species are classified in the genus, though current molecular genetics research suggests that significant reclassification of the Pachycephalidae may be needed.-Species:* Variable...

, Ifrita kowaldi, Colluricincla megarhyncha). It is the most potent non-peptidal neurotoxin known.
Batrachotoxin comes from the Greek words "batrachos" (βάτραχος), meaning frog, and "toxine" (τοξίνη), meaning poison.