Hello. ^^
First off, you're in the right place if you need meshes. Here's some stuff that may be useful for your map...
>Courtney (http://courtneyrc.deviantart.com/)on DeviantArt has a really nice moss nest (http://feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=13556.0/) that would look nice in any den.
>Thierry (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&action=profile&u=28190) has a really cool den made of sticks and twigs here (http://feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=8174.msg196067#msg196067/).
>Jayfeather55 (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&action=profile&u=39473/)has a bunch of Impressive Title Animals (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=10836.msg151792#msg151792/) that I bet you could use as prey.
>Glave (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&action=profile&u=49261) has a hawk (http://feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=10942.0/) that flies around the sky of your map that could be used as prey. Just be noted, it's a particle instead of a mesh.
>Hammy (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&action=profile&u=1947/) has a ton of caves (http://onelittlecorner.proboards.com/index.cgi?board=fhdownloads&action=display&thread=6/) that can be used as dens.
Well, that's all I've got for now, but I can go poke around s'more. ;P