I found this in the backyard A big pile of poop!

Holy cow!  Contained fur and seeds among other things.  What was it?
Looked it up in my "Animal Tracks and Signs" book and it appears to be from a big cat. 
"Droppings that are not covered are normally 4-5 inches long and can be confused with those from coyotes, although constrictions in several places along its length are characteristic of bobcat dung. Scats may be broken into segments due to those constrictions."  
I'm thinking a big Bobcat was out there.  I need to reinstall the critter-cam and get the pistol ready.  That was a human sized poop!