 Dear students, in this topic we shall discuss the sexual selection and made choice. The sexual selection among members of a species may be of two types, inter-sexual selection and intra-sexual selection. First we shall discuss the inter-sexual selection. Intersexual selection involves made choice in which the members of one sex choose the maids from opposite sex with particular characteristics, for example appearance, color, courtship, songs, etc. The inter-sexual selection has led to sexual dimorphism in secondary sexual characteristics during evolution. For example, in different species, features are developed which can attract members of opposite sex. For example, ornate plumage of birds. Birds' feathers have many ornamented and beautified plumages, they are actually secondary sexual characters to attract maids. Similarly, deer have antlers, and loins have maids, so these are secondary sexual characters which show sexual dimorphism and help in inter-sexual selection. These selective characters correlate with the general health and vitality of a mate. The purpose of a mate choice is to choose a healthy partner which is likely to enhance the reproductive success. Mate choice patterns vary among species. In some species, females make choice for their maids and in other species, males make choice for their maids among the or from the available pool of females. Dear students, now we shall discuss inter-sexual selection. It involves competition for maids between the members of same sex. This competition is to get access to the members of opposite sex. It mostly occurs between the males. Many such competitions involve male-to-male combat or fight. Such individuals have developed weapons for competition, for example, horns, antlers, etc. There are two main types of competition among males over females. First is scramble, and second is contest competition. Scramble is simply a race to get the female first and grab her. Scramble may male body size or vigor contribute to success. Contest competition, this is more typical form of competition. This may males with best fighting skills and techniques, largest body size or largest weapons will win the mate or female partner.