Yes, I use a Nikon D70S. Any tips are always appreciated!
I have never shot a D70, but I assume the focusing points work similarly to the D40, D80 and D300 that I own.
What I do, when shooting animals, is set the focus to a single point, and then I move that single point to the eye of the critter if it is standing still, or to the area where the eye will be when if it is moving around. Then, I simply track the eye with that focus point.
This works best on the D300 which has an amazing 51 point system that lets me compose almost perfectly every time...
The D80 only has 11, but still they are well placed for this...
The D40 has but three, which makes it very difficult to focus this way, so I often have to focus "the normal" way. To me, the three autofocus points is a REAL limitation of the D40 that nobody really talks about.
Anyway, the D70 has 11 focus points and I assume they work like the D80's.
I have found that, whatever else happens, the eyes absolutely must be in focus for all but "special effects" pictures of critters. Using one focal point on a moving critter and tracking the eye is actually quite difficult, but it really makes the image pop when you nail it. When they are still, it is not nearly as tricky...
Just a tip I have found helpful.