That is a fun coincidence. How much have you done so far? These are the programmes I've watched through thus far:
- The Wild Cattle of Cambodia (1957)
- Survival Anglia (1961-2001) - 2 out of over 900 episodes
- The World About Us - 3 episodes so far, 1 from 1970 and 2 from 1980
- The Vanishing Hedgerows (1972)
- Web of Life (1973) - 1 episode out of 7
- David Attenborough's Fabulous Animals (1975) - all 6 episodes
- Wildlife on One - 182 out of 253 episodes
- Life on Earth - all 13 episodes
- Animal Olympians (1980)
- Fragile Earth (1982) - 5 out of 6 episodes
- Natural World - 75 out of 532 episodes
- Zoo 2000 (1984) - 1 out of 8 episodes
- World Alive (1984) - 1 of an unknown number of episodes
- Durrell in Russia (1985) - 4 out of 13 episodes
- The Really Wild Show (1986-2006) - 8 out of 218 episodes
- Supersense (1988-1989) - all 6 episodes
- The Great Rift (1988) - all 3 episodes
- Wildlife Showcase (1985-1995) - 1 out of 59 episodes
- World's Most Secret Animal (1989) - all 10 episodes; I know it isn't a nature documentary, but I wanted to note everything down anyway
- Trials of Life (1990) - all 12 episodes
- Arabia - Sand, Sea and Sky (1990) - all 3 episodes
- Lifesense (1991) - all 6 episodes
- Realms of the Russian Bear (1992) - all 6 episodes
- The Velvet Claw (1992) - all 7 episodes
- The Wild West (1994) - all 3 episodes
- Nightmares of Nature (1995) - all 5 episodes
- Alien Empire (1996) - all 6 episodes
- Spirits of the Jaguar (1996) - all 4 episodes
- Incredible Journeys (1997) - 5 out of 6 episodes
- The X Creatures (1998) - all 6 episodes
- Supernatural (1999) - all 6 episodes
- The Life of Mammals (2002) - all 12 episodes
- Weird Nature (2002) - all 6 episodes
- Wild New World (2002) - all 6 episodes
- Wildlife Diary (2002) - all 26 episodes
- Life in the Undergrowth (2005) - all 5 episodes
- Europe - A Natural History (2005) - all 4 episodes
- Animal Crime Scene (2005) - all 5 episodes
- Planet Earth (2006) - all 11 episodes
- Deadly 60 (2009-2024, more to come) - all 81 episodes so far
- Africa (2013) - all 6 episodes
- Deadly Pole to Pole (2013-2014) - all 25 episodes
- The Wonder of Animals (2014) - 6 out of 12 episodes
- Thailand: Earth's Tropical Paradise (2017) - all 3 episodes
- Seven Worlds, One Planet (2019) - all 7 episodes
- Eden - Untamed Planet (2021) - all 6 episodes
- The Mating Game (2021) - all 5 episodes
- Attenborough's Life in Colour (2021) - both episodes
- Asia (2024) - all 7 episodes
Birds are probably the best animals for such a year/lifelist - so many documentaries seem to slip in lots of rather interesting birds in the background or in brief clips without making a note of what they are. I'd need to double check how many birds I've recorded so far, but it's probably in the hundreds already.