sperm velocity

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tags: evolution, evolutionary biology, evolutionary ecology, plumage color,carotenoid-based colour, carotenoids, lipid peroxidation, oxidative stress, sperm motility, sperm quality, sperm velocity, birds, ornithology, Great Tit, Parus major, researchblogging.org,peer-reviewed research, peer-reviewed paper Great Tit, Parus major. Image: Luc Viatour, Creative Commons/Wikipedia [larger view] In some species of birds, males are more brightly colored than females. This phenomenon…