As has been noted, closer is better. However, most of my wildlife shots are taken in Kruger Safari Park where one has to follow some basic rules
1. You are not allowed out of your vehicle except at authorised " get out points ". These tend to be picnic areas full of people or loooooooooooooong bridges. Neither of these are really condusive to wildlife shots.
2. You are not allowed any part of your body to protude out of the vehicle. This makes photography difficult. Most of my shots with the 70400G are handheld from a cars side window!!!!! Fun. lol
Howver, one day, I will get that elusive "fantastic" shot.