Calf update: an elusive and blurry pair

The bison on our ranch are 100% wild bison and, even though they may become accustomed to my presence, they rarely fail to remind me of this fact.   A most recent example of bison wildness has been the virtual disappearance of the new bison mother and her calf.  After I first managed to photograph the newborn and it's mother they both went into hiding and it wasn't until this morning to I managed to catch a glimpse of the pair on one of my surveillance cameras.  Both mother and calf seem healthy. 

I may also have started hearing some of the very quiet low-pitched grunts a bison mother makes to her calf, but I'm not entirely certain.