Masaru Hasegawa currently works at Sokendai (the Graduate University of Advanced Studies) in Japan. He and his colleagues have studied Japanese Barn Swallows, Hirundo rustica, particularly on sexual selection, for more than ten years. After a PhD on sexual selection for multiple plumage ornaments in Japanese Barn Swallows at the University of Tsukuba, he did a PostDoc on mate preference for secondary sexual characteristics and other individual attributes. His research interest includes animal contest, courtship behaviour, and plumage coloration.

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