Even at the very top of Colorado 14'ers, you'll find pesky ol' Marmots.
These critters are always looking for scraps and can be quite agressive.
Even toss a few rocks at 'em will typically just spook 'em for a short time,
and they'll soon return, looking for a handout. While some people might
things these guys are cute, I'd personally classify 'em as
vermin(some funny stories at that link) and I think the
closeups below leave no doubt about that! ;-)