Gonçalo C. Cardoso is a research scientist at CIBIO-University of Porto, Portugal, working in the fields of Behavioural Ecology and Evolutionary Biology. He specializes in social behaviour, the function and evolution of sexual signals. Ricardo Jorge Lopes is a research scientist at CIBIO and Curator of the Bird Collection at the Natural History and Science Museum of the University of Porto (MHNC-UP). He is an evolutionary ecologist with a strong focus on conservation, and uses canaries as a model species to investigate the genomics of evolutionarily relevant traits. Paulo Gama Mota is Associate Professor at the University of Coimbra, Portugal. Most of his field and laboratory research concerns animal communication and mate choice behaviour, using the canary and its closest relative (the European serin) as model study species. He has had a long experience as director of different science museums.