Never threaten a mother and her babies.  This prairie dog is willing to
go head-to-head with a rattlesnake to keep her family safe in this video posted by Discovery on July 3, 2013.

Having faced down a rattlesnake once, I doubt I would have the tenacity that this mother prairie dog shows.  But she does have home and family at risk, so I suspect that her adreneline is quite jacked-up!

More cool animal videos can be found here!