Why a male bird has brighter colours than a female bird?

Introduction: Male birds are more colourful

It is a common observation that male birds are more colourful and eye-catching than their female counterparts. This phenomenon is not just limited to a few species but is widespread among avian species. The difference in colouration between males and females has fascinated naturalists for centuries, and many theories have been proposed to explain this difference.

Sexual Selection: Explanation for colour difference

One of the most widely accepted theories to explain why male birds have brighter colours than females is sexual selection. According to this theory, the difference in colouration is due to the different mating strategies of males and females. In most avian species, males compete with each other for access to females. The males that are successful in attracting females are rewarded with the opportunity to mate and pass on their genes.

Females, on the other hand, are generally more choosy when it comes to selecting a mate. They look for males that exhibit traits that indicate good genes, such as bright colours, elaborate plumage, and complex songs. By choosing high-quality males, females increase their chances of producing healthy offspring. This process of mate choice results in the evolution of elaborate male traits, including bright colours, that are used in courtship displays to attract females.