The strongest poison any known creature makes on its own is batrachotoxin, found in the so-called Poison Dart Frog.
自然界已知毒性最强的物质是箭毒蛙毒素,存在于箭毒蛙体内。
英语百科
Batrachotoxin
Batrachotoxin (BTX) is an extremely potent cardiotoxic and neurotoxic steroidal alkaloid found in certain species of frogs (poison dart frog), melyrid beetles, and birds (Pitohui, Ifrita kowaldi, Colluricincla megarhyncha). Batrachotoxin was derived from the Greek word "batrachos" meaning "frog". Structurally related chemical compounds are often referred to collectively as batrachotoxins.