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Article

Chemical analysis reveals sex differences in the preen gland secretion of breeding Blue Tits

Acoustic and visual signals are well known to play important roles in social communication in birds. Growing evidence suggests that many bird species, including species of songbirds, additionally have a well-d...

Barbara A. Caspers, Reinaldo Marfull, Tim Dannenhaus, Jan Komdeur… in Journal of Ornithology (2022)