Have a look at these:http://www.arkive.org
http://www.arkiveeducation.org and http://www.wildfilmhistory.orgall are packed with natural history videos and are free to download/watch.
I’ll be adding a link to this forum from the sites asap, anyone know how i put in a link request from this site?
p.s. All the websites are free and Sir David Attenborough is the patron.