Female birds often sport less colorful plumage than males of the same species. Some birds evolved this sexual dichromatism as an adaptation related to mating and survival, but scientists still don’t ...

Sexual dimorphism — physical differences between the sexes of the same species — is a widespread and fascinating, yet mysterious, natural phenomenon. It even captivated Charles Darwin and inspired him ...

Male and female birds are often quite different. Looking at two individuals of radically different color, it’s sometimes easy to forget this. I often talk to people who think they have multiple kinds ...