Hi Tommie, there are lots of options (these are just a couple that I know about / have used). The Specan() function in the package WarbleR will do what you want but it will take quite a lot of time if you've got lots of files because it extracts lots of different parameters from each file. If it is too time-consuming to do this (I don't think you can tell it to exclude parameters that aren't of interest), then another option would be to use the Seewave package, where with a bit of work you'd be able to get the specific parameters of interest - eg fpeaks() caculates a peak frequency for a sound. Links to both below. There are lots of functions/packages that will do something like this kind of thing, and it does usually take a bit of trial and error to find the one that does it closest to how you want. https://www.rdocumentation.org/packages/warbleR/versions/1.1.25/topics/specan https://rug.mnhn.fr/seewave/

Eric - what is the programming package/solution you are going to use for the localisation of Bitterns? I'm hoping to do a similar thing with Curlew territories Alex - I'll be really keen to join the Groupgets for the GPS boards as well, that degree of accuracy would be great. Cheers, David

That sounds like a brilliant tool, will look forward to using it and thanks for the useful reply Alex.

Thanks Alex, that's really useful to know - I'll wait till next breeding season to give this a try! David