Some problems mainly in wildlife photography are bad lighting conditions, which leaves your images with lots of noise, poor contrasts and dirty colours.
One way to sort these issues out is by post production which will help you recover your images.
When shooting in high ISO you will get lots of noise in your images. One way to help recover the image is to use software such as Adobe Lightroom and Photoshop.
Below is an before and after image to show my post production results.