That's neat that the cats gets to watch them.  I love watching them, too...the deer and the birds. 
Sometimes the mama deer bring their little ones to the back part of our property under the trees
and up closer to the house in what used to be a peach orchard but is now just a field next to the 
house.  Last summer there were twin babies running around out there.  They were so tiny, when
they laid down in the tall grass you couldn't tell they were there.