Night howlers

Night howlers (also known as Midnicampum holicithias) are toxic flowers that can turn civilized animals aggressive. Bellwether and Doug use the flower to concoct a drug to turn predator animals savage, including Mr. Manchas the black jaguar and Mr. Otterton the otter.

Night howlers contain psychotropic chemicals that have deadly effects on animals exposed to them. However, concentrated amounts of the plant's chemicals will cause larger animals to become savage if they are exposed, causing them to lose higher reasoning functions and lash out at anything that moves. The night howler's chemicals can even affect animals that do not have a naturally violent or ferocious disposition - as evidenced by their ability to turn non-predator animals, such as rabbits, aggressive.