You asked

Is the nikon d3400 good for wildlife?

Yes, with the right lens. The D3400 is an APS-C camera, so every lens gets 1.5 times its reach, which helps a lot with distant animals. The body has no stabilisation, so choose lenses with VR or OS, and use fast shutter speeds. Wildlife and sport is the hardest kind of photography and the most gear-dependent, so the lens matters more than the body here.

Good places to start on this camera:

Good long lenses are easier to afford used, since they hold their value well.

Written by Claude from this site's pages.

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