I like to take pictures from hides where you are likely to see natural behaviour. A car is often referred to as a mobile hide and that can work too. However, as a wildlife photographer who wishes to realise a good range of pictures you need to be flexible in your approach.
Last night I set out to get pictures of this Roebuck. I've tried before with, at best, limited success. As a prey species Roe Deer have superb senses with sense of smell and sight being particularly acute. On foot I am limited in carrying ability so, for once I left the tripod behind and relied on a bean bag to rest on the wall.
You can see it worked; I was able to get a very close but obscured view before the buck moved into shorter grass and showed the whole animal.