While blue birds may not actually be harbingers of happiness ... Color: Males are a bright, iridescent blue-green with blackish wings and tail and white underparts. Females are a dull brown ...

Hoatzin have some pretty weird traits, with mohican crests, blue facial ... Although the wing claws of juveniles seem prehistoric, they may have evolved more recently to help these birds survive ...

During mating rituals, male birds show off ... They fold their long wings back around their streamlined bodies and plunge into the water from as high as 80 feet. Blue-footed boobies can also ...