Poisonous Drugs and Antidotes

S1 E4: Is it possible that animals have pharmaceutical knowledge of the power of certain substances? Why do species of curassow consume kaolin (china clay) after eating certain fruits? Arrowhead frogs devour poisonous insects that somehow manufacture batracotoxina, the most potent poison created by nature. What type of antidote does a certain sea nudibranquios possess?