Hello,
I am a new bunny owner of a 7 week old female Lionhead/Dwarf.
Lately, I’ve been hearing her make this weird noise while she eats and grooms.. it sounds like a dove/pigeon cooing or it sounds like the sniffles. Her nose is not wet, there is no discharge, and we’ve taken her to a vet but she doesn’t make that same noise unless she’s in her own cage or being pet/held by us? At the end of the appointment, our vet asked that I record her making that sound before he can diagnosis but otherwise he said everything seems normal. She has been usually an active little one -eats well, poops, pees, etc but today was a bit off, didn’t want to do much jumping around and kinda just loafed instead… or maybe she could be grumpy because I took her to the vet again?
I am worried because it doesn’t sound like “honking” or grunting, or any of the other sounds I’ve been told other bunnies make.
Anyway, I am going to let my vet hear my recorded version of her cooing.. but until then.. anyone else have any ideas what this means? 
Video of my bunny making that ‘cooing’ noise: http://youtu.be/cnuRYUMDhJE
Video of another bunny that makes a VERY similar noise: http://www.youtube.com/watch?v=dG_Y0b07Lac