This type of evolution is often seen in species that have a close relationship, such as predator-prey, host-parasite, or mutualistic relationships. Examples of coevolution can be seen in many species, including plants, animals, and even bacteria.

One of the most well-known examples of coevolution is the relationship between flowering plants and pollinators. Flowering plants have evolved to produce nectar and pollen that attract pollinators, such as bees, butterflies, and hummingbirds. In turn, the pollinators have evolved to be more efficient at collecting nectar and pollen from the flowers. This mutualistic relationship benefits both species, as the plants are pollinated and the pollinators receive food.

Another example of coevolution can be seen in the relationship between certain species of ants and the plants they feed on. The ants have evolved to feed on the nectar and sap of certain plants, while the plants have evolved to produce nectar and sap that the ants can feed on. This relationship benefits both species, as the ants are provided with a food source and the plants are provided with additional protection from predators.