You asked

Is the olympus om d e m5 good for wildlife?

Yes, it can work well for wildlife. Micro Four Thirds crops in, so a 300mm lens frames like 600mm on full frame, and you get that reach in a smaller, lighter package than most systems give you. The original Olympus OM-D E-M5 has five-axis stabilisation in the body and weather sealing for damp hides. Its Mark II adds a fully articulating screen, and the Mark III has 20.4MP.

For reach on the E-M5, I'd look at these:

Wildlife is demanding, so read wildlife and sport first, and consider buying used to try a long lens cheaply.

Written by Claude from this site's pages.

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