 Dear students, in this topic we shall discuss the foraging behavior of animals. Foraging behavior includes all the activities of an animal which are related to search, recognize and capture food items. An animal living in an environment has certain available choices of food and animal has to make decision about these choices. These choices include, for example, what items should be included in the diet? If the food is in patches, what path should an animal take between the patches? How should it locate new patches of food? And if the food is depleted in one patch, when should an animal depart to seek another patch of food? All animals require decisions among such choices. For example, hummingbirds or bees, which use flowers, juice or nectar, they have to make such choices. Similarly, owls, which pick small rodents in different areas or habitats and eat them, also have to make such choices because they have patches, these types of flowers or their prey are distributed in patches and when the food is depleted in these patches, such animals have to make decisions. Dear students, The nutrition here, this is essential for an animal's survival and reproductive success. These types of processes which are important for survival, include nature selection and evolution, which play an important role. The reason is that foraging behavior is also under natural selection, on which evolution and nature selection have operated. Genetic basis or the role of evolution and nature selection in foraging behavior is very important when we see that a gene variation is found in the drosophila, which is called forager gene. This forager gene detects the food search behavior in their larvae and these larvae have two types of variations of this gene, forager gene, one is the rover allele, which is represented by R, whereas the second is the ceter allele, which is represented by small s. This forager locus produced by this enzyme is involved in a signal transduction pathway which dictates their feeding habit. The reason is that this enzyme is more active in the rover allele possessing individuals i.e. for R, which produces a more active enzyme as compared to the ceter allele which is present in certain larvae. These larvae that are in the rover go far enough to search for food, while the ceters search for food only close to them, the chances of their survival will be high. That means that in the natural selection and in the development of genetics, such genes have evolved which support foraging behavior. It means genetic components are behind the foraging behaviors.