Dear colleagues, Our opinion paper 'Strange Seal Sounds: Claps, Slaps, and Multimodal Pinniped Rhythms' has recently been published in Frontiers in Ecology and Evolution. The paper is available here: https://doi.org/10.3389/fevo.2021.644497 . If the link above does not work and you would like to obtain a PDF, do not hesitate to contact me at: andrea.ravignani@mpi.nl . Kind regards, Andrea Andrea Ravignani Group Leader, Comparative Bioacoustics, Max Planck Institute for Psycholinguistics