Poison is defined as a substance that causes injury, illness, or death through chemical or other activity when introduced to a living organism. Venomous animals are capable of delivering toxins through biting or stinging using specialized glands, while poisonous animals contain toxic tissues throughout their bodies without a delivery mechanism. Examples of dangerous terrestrial and marine animals are provided, including snakes, spiders, scorpions, fish, jellyfish, and frogs. Case studies describe incidents where a couple in India allegedly died from snake bites under suspicious circumstances, and an 18-year-old reptile lover in Texas committed suicide by intentionally allowing a cobra to bite him repeatedly.