You asked

Is the nikon z 28 400mm f 4 8 vr good for wildlife?

Here is what the site says about that.

From Nikon Z 28-400mm f/4-8 VR: Nikon Z 28-400mm f/4-8 VR: A zoom lens by Nikon for Full frame cameras, 28-400mm f/4-8. A 14x travel superzoom for full frame. Specs - Maker: Nikon - Focal length: 28-400mm (zoom) - Maximum aperture: f/4-8 (it gets darker as you zoom in) - Made for: Full frame sensors - Mounts: Nikon Z - Stabilised: yes - Autofocus: yes What it frames like - On full frame (Nikon Z): as marked, 28-400mm. - On APS-C ...

From Wildlife and sport: My picks: - Starting out: an APS-C mirrorless body with a 100-400mm-class zoom. The best value reach there is. - Hiking and travel wildlife: Micro Four Thirds with a 100-400mm. Light, long and stabilised. - Serious sport and birds: a full-frame body with fast readout and a 200-600mm or 150-600mm zoom. Buy used: long lenses hold their value and change hands a lot, and the savings are large. See buying used.

Quoted from this site's pages.

From these pages