Thank you so much to everyone who got in touch with offers of sound files for us to use in our visitor centre. We had responses from lots of places and have a nice collection of files now, so thank you to such a helpful community! I thought I would share some of the public websites that were mentioned for reference. William Watkins marine mammal sound database https://cis.whoi.edu/science/B/whalesounds/index.cfm Sea of Sound, Cornell http://www.birds.cornell.edu/page.aspx?pid=2230# NOAA SWFSC https://swfsc.noaa.gov/textblock.aspx?Division=PRD&ParentMenuId=148&id=5776 NOAA NEFSC https://www.nefsc.noaa.gov/psb/acoustics/sounds.html Thanks again, Bryony and Jen, Manx Whale and Dolphin Watch