You asked

Is the fujifilm gfx 50r good for wildlife?

Here is what the site says about that.

From Fujifilm GFX 50R: Fujifilm GFX 50R: A mirrorless camera by Fujifilm with a 51.4-megapixel medium format sensor, announced in 2018. A flat, rangefinder-style GFX body with no stabilisation. Specs - Maker: Fujifilm - Mount: Fujifilm G - Sensor: Medium format (44 x 33), 43.8 x 32.9mm, crop factor 0.79 - Resolution: 51.4 megapixels - Stabilisation: none in the body; use stabilised lenses for slow shutter speeds - Announced: 2018 - Type: mirrorless camera Focal lengths on ...

From Wildlife and sport: Wildlife and sport: Wildlife and sport are the hardest things to photograph, and the most gear-dependent. The subject is far away, it moves fast, and it won't do it again.

Quoted from this site's pages.

From these pages