My recommendation is to stick to ISO values between about ISO 100 (best image quality) and 800 (acceptable image quality) with most entry-level cameras.
What ISO values should you use for wildlife photography? My recommendation is to stick to ISO values between about ISO 100 (best image quality) and 800 (acceptable image quality) with most entry-level cameras. Even cameras that are 10+ years old can still produce usable images up to about ISO 800. Some of the newest full-frame cameras still look good up to ISO 3200 or 6400.