Walking with Dinosaurs (the entire walking with series too), though a lot of it is really outdated with 20 years of additional science, it was my fucking jam, pretty sure we were the most frequent renters of the series from our library when I was a kid.

Becoming Human by Nova is sorta like an updated Walking with Cavemen, though to be fair it's probably been a while since (oh god it's 13 years) that was released but the information should be a bit better.

Amazing Dinoworld was pretty interesting and quite visually good too but the episode on the polar dinosaurs implying they were on the verge of evolving human-like intelligence was a bit far for speculation.

To be honest my good natural history content has shifted onto youtube where they might spend 10 minutes talking about a specific topic rather than create a large involved piece, but they also don't need to go wild with making dinosaurs fight to the death for entertainment value.

Natural World Facts has some really well done videos on ocean life.

Journey to the Microcosmos does a lot looking at microscopic life, something often not expressly shown on camera.

SEA does a bit longer form stuff about specific topics related to the universe rather than life on earth, practically the same length as a TV hour long documentary minus the commercials to be honest.