Sue
You haven't said whether you want to play this on PC or on a DVD player (or both).
If you only want to play it on a PC then a DVD-ROM such as BWPi is fine, but it won't play on a DVD player. So if you want to play it on a PC
and a DVD player you want a DVD-Video and we (Bird Images) produce a range of these - the website is
www.birdvideodvd.com.
One of them - British Bird Songs - may well be ideal for your purposes.
If you want an independant summary then BBC Wildlife magazine did a review of CDs and DVDs in the January 2006 issue (we came top!). Back issues can be bought here
http://www.bbcwildlifemagazine.com/viewIssue.asp?id=509.
I hope that helps.