Complete series guide
Nature
Browse every available season and open its complete episode list.
All seasons
Seasons and episodes
45seasons
Season 1Season 113 episodes 
Season 2Season 213 episodes 
Season 3Season 318 episodes 
Season 4Season 420 episodes 
Season 5Season 520 episodes 
Season 6Season 621 episodes 
Season 7Season 720 episodes 
Season 8Season 820 episodes 
Season 9Season 921 episodes 
Season 10Season 1021 episodes 
Season 11Season 1118 episodes 
Season 12Season 1214 episodes 
Season 13Season 1315 episodes 
Season 14Season 1414 episodes 
Season 15Season 1514 episodes 
Season 16Season 1616 episodes 
Season 17Season 1716 episodes 
Season 18Season 1818 episodes 
Season 19Season 1916 episodes 
Season 20Season 2017 episodes 
Season 21Season 2114 episodes 
Season 22Season 2213 episodes 
Season 23Season 2313 episodes 
Season 24Season 2413 episodes 
Season 25Season 2516 episodes 
Season 26Season 2613 episodes 
Season 27Season 2713 episodes 
Season 28Season 2810 episodes 
Season 29Season 2916 episodes 
Season 30Season 3013 episodes 
Season 31Season 3113 episodes 
Season 32Season 3219 episodes 
Season 33Season 3317 episodes 
Season 34Season 3416 episodes 
Season 35Season 3517 episodes 
Season 36Season 3616 episodes 
Season 37Season 3715 episodes 
Season 38Season 3818 episodes 
Season 39Season 3913 episodes 
Season 40Season 4013 episodes 
Season 41Season 4113 episodes 
Season 42Season 4217 episodes 
Season 43Season 4313 episodes 
Season 44Season 4413 episodes 
Season 45Season 455 episodes