This squirrel was paused for a moment as it was scurrying up this tree, I was able to catch it in time but my settings were quite dark so all I had was a silhouette. As I was shooting in RAW it allowed me a much greater latitude in post process to lighten things up and extract some more detail from this little critter. The second shot is closer to the original exposure and only brightened a little bit to show the difference between a more wholesale edit and a slight one. If a shot is to dark and you have the RAW file it is possible to bring much more out of it if you take the time to play with the exposure and white and black levels so its never a lost shot if you have enough detail in the file to work off.
Nikon D750 1/200 sec. f/6.3 ISO-80 at 500mm
Nikon D750 1/320 sec. f/6.3 ISO-80 at 500mm