Beetle
Beetles have a wide range of chemical defences, mostly got from plants their larvae eat. These chemicals make them taste bad when predators eat them. Blister beetles are so poisonous that if a horse eats only a few of them, the horse may die. Bombardier beetles squirt hot poisonous liquid at attackers. Lady beetles put out a cyanide compound when agitated. Lady beetles also have colours that warn predators that they taste bad. Insects which taste foul use warning colours which birds learn to avoid. Also, other species which are tasty copy those warning colours. This is a type of mimicry, and is quite common in insects.