Abstract: A proactive repellent and camp perimeter defense against apex predators is provided. In an implementation, the proactive repellent is a liquid agent or aerosol tuned to the sensitive olfactory senses of apex predators. Ingredients catch the attention of the apex predator, while also providing olfactory aversion signals. The example repellent can be applied around an area to be proactively protected via delivery methods such as spray, aerosol, gel, or stream apparatuses, or by foam, cloth, gauze, sponge, wick, or swab applicators. The repellent then dries, emitting repellent odors and chemicals in both liquid and dried states. The example repellent may be pre-applied to artifacts, such as string, cord, or ribbon for surrounding a campsite, or on cards, tubes, sticks, balls, granules, and stakes. An example device may be worn by a hiker as a cartridge, nodule, capsule, aerator, or fabric evaporator, and then reused by rewetting with the example repellent.