You asked

Is the panasonic lumix g100d good for wildlife?

The G100D is a sensible body for wildlife, mainly because its 2.0 crop factor doubles the reach of any lens you put on it. The catch is that the body has no stabilisation, so the lens has to supply it for slow shutter speeds. Wildlife and sport are the hardest thing to photograph and need long lenses, so the lens choice matters more than the body.

For the most reach, I'd look at the OM System M.Zuiko 150-600mm f/5-6.3 IS, which frames like 300-1200mm on full frame. If you want something faster and more versatile, the Olympus M.Zuiko 150-400mm f/4.5 TC1.25x IS PRO is a serious option. For a lighter start, the OM System M.Zuiko 100-400mm f/5-6.3 IS II is a good balance. Long lenses are also easier to try used, since good lenses hold their value well.

Written by Claude from this site's pages.

From these pages