My Dad is a Wildlife photographer (hobbyist), specifically Birds.
I know what it's cost him in gear, time and patience to get nice images (I covet his Canon 300 f/2.8 II).
This is one of about 3 "Wildlife" photos I have ever taken
I'm just not into that side of the hobby. To me it's about patience and technical equipment more than "art" and David Attenborough's crew have patience and technical equipment in abundance.
I'm not sure I'd even take my DSLR on Safari. I'd want to watch it rather than document it, it's been documented far better than I can ever hope to achieve.
It was chained to a perch in the Hawk Conservancy in Hampshire.
It saved me having to travel where mosquitos live and also saved me £3K on an appropriate lens for "Twitching".
When I want even more exotic animals I may be tempted to travel even further afield... to Marwell Zoo, near Winchester.. but that's 15 miles away... so maybe some time in the future.