Anecdotally, this isn’t surprising. I’ve always enjoyed nature documentaries, and since getting a large TV and decent sound system, I really enjoy them. They’re very calming to watch as a winding-down activity at night.
What sibling comment said. Planet Earth is probably the most famous series, and for good reason, but Netflix also has a bunch of others he’s narrated that are quite good.
I also really liked Dancing With The Birds, with Stephen Fry, but tbf I find birds fascinating.