You asked

Is the sony fx3 good for wildlife?

Yes, with the right lens. The FX3 is a full frame video body with in-body stabilisation, but at 12.1 megapixels you can't crop far into a distant bird, and it has no viewfinder, which makes tracking fast subjects harder. I'd call it a strong choice for wildlife video, and a less obvious one for stills.

For reach, these are the lenses I'd look at on it:

If the budget is tight, buying long lenses used is the easiest way to try them. For more on what makes this kind of shooting hard, see wildlife and sport.

Written by Claude from this site's pages.

From these pages