You asked
Is micro four thirds good for wildlife?
Yes, I think Micro Four Thirds is one of the best choices for wildlife. The sensor is small, so a 300mm lens frames like a 600mm on full frame, and you get that reach in a light, cheap kit. The sensor sizes guide explains the maths.
My pick for hiking and travel wildlife is Micro Four Thirds with a 100-400mm zoom: light, long and stabilised. If you want a body built for animals, the OM System OM-1 Mark II is a favourite of mine, with very good bird detection and a light kit. For more on the whole approach, see Wildlife and sport, and consider buying used to save a lot on long lenses.
Written by Claude from this site's pages.