What is the difference between hunting deer and hunting elephants in Africa?

The difference between hunting deer and hunting elephants is overall

1) elephants are poached more and there are fewer of them

2) elephants are a keystone species and thus are more important to their own ecosystem then deer; meaning that if their population decreases it will create a greater impact than a decrease in deer population.

There are also other reason like for instance they are two different species, but basically that's it.