Contractions and transport visualized in an entire epididymis of the neonatal rat. Movie shows the corpus of an entire collagen-embedded epididymis. This video (http://movie-usa.glencoesoftware.com/video/10.1530/REP-19-0617/video-1) is available from the online version of the article at https://doi.org/10.1530/REP-19-0617.