When a predator uses venom to catch prey, it's an example of:
Venom is a chemical predatory weapon because toxins delivered by a bite, sting, fang, harpoon, or nematocyst disrupt prey physiology. Components may block ion channels, impair neuromuscular transmission, damage membranes, alter coagulation, or initiate rapid tissue injury. Immobilization reduces escape and shortens pursuit or handling time, while digestive enzymes may begin extraoral processing. Calling this “chemical warfare” is informal, but it correctly distinguishes chemical incapacitation from purely mechanical capture. Mimicry relies on resemblance or deceptive signaling, ambush describe
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 14