Adults may have many mates, or they may mate with just one individual. Birds have proven to be valuable subjects for studies on the behavioural endocrinology of courtship for many years. Courtship behaviors are one type of display behavior. For example, display behaviors may be used to warn other animals to stay away, as you will read below. Female mammals gestate their young internally and provide nutrition after birth through lactation. Naturalists studying bird courtship or parental care of the young by mammals strive to blend into the background or watch from a great distance, or they may rely on a camera concealed in a shrub. Mating and Courtship. Notably, those pinnipeds that breed in the water or on ice (walrus and ice seals), which may have more difficulty defending an unstable environment, tend to be less polygynous. The relationship between mates varies by species. In this fish, courtship ensures that the two members of the partner are going to produce eggs fairly, in what has been called “egg trading”. In this behaviour, the couple alternates the role of the sexes up to four times throughout a single mating. As of this moment, the best scientific model that explains courtship behavior is The Selfish Gene model proposed by Richard Dawkins which states that an individual of a particular species will mate with individuals from the same species that display "good genes". Courtship behaviour in Drosophila is an innate behaviour and fly displays sexual behaviour upon encountering a suitable partner. Mating refers to the union of a male and female of the same species for reproduction. The mating behavior of male and female mammals differs in part because of the physiology of mammalian reproduction. As males, they fertilise their partner’s eggs. Courtship behavior in the Gerridae involves the production of low-frequency surface waves by males (Wilcox and Spence, 1986). A display behavior is a fixed set of actions that carries a specific message. “They will fight, scrap, steal and destroy each other’s structures,” Verdolin says. Reproductive behavior in marine mammals includes polygyny and promiscuity and pinnipeds species that breed on land compete for reproductively active females by defending breeding territories. During courtship, male satin bowerbirds build nuptial bowers – which look a bit like towers of sticks – and decorate them with exclusively blue objects. Mates may stay together only while mating, for an entire breeding season, or even for life. Films of behavior made in natural settings appear at face value to provide intimate looks at nature free from human influence. Although many display behaviors are used to attract mates, some display behaviors have other purposes. The peacock displays his tail as part of courtship. Species with elaborate courtship are found in many other taxa, from insects to fish to mammals, however birds communicate surprising that courtship behaviour in males and females is modulated by gonadal hormones.