Animals use their keen sense of smell to locate food sources by detecting odor molecules in the air or on the ground. They have specialized cells in their noses called olfactory receptors that are able to detect these scents. As animals move around their environment, they follow scent trails and use their sense of smell to track down potential food sources. This ability to locate food using scent is especially important for animals that hunt for their food or forage for plants in their natural habitats.