Biochemical pesticides are similar to naturally occurring chemicals and are nontoxic, such as insect pheromones used to locate mates, while microbial biopesticides like Green Muscle come from bacteria, fungi, algae or viruses that either occur naturally or are genetically altered.

The sense of smell enables pleasure, can subconsciously warn of danger, help locate mates, find food, or detect predators.

Also being investigated is the role of semiochemicals in enabling individual bugs to locate potential mates and suitable host plants, and whether such chemicals could be used as a possible means of control.

Since many of these fish live in regions where there is no natural illumination, they cannot rely solely on their eyesight for locating prey and mates and avoiding predators; deep-sea fish have evolved appropriately to the extreme sub-photic region in which they live.

They went from house to house, locating the captains and mates of local fishing boats.

Thus they need to be continually on the move, to develop specialized ways of finding food sources, avoiding danger and locating mates.

Instead of vision, the animal is thought to use olfaction as the primary sense for foraging, as well as locating or identifying potential mates.

Bioluminescence: Adult firefly uses self-generated light to locate mates.

Calls are important for helping birds locate potential mates and distinguishing between species, and may also help individuals assess the quality of potential mates.