Secrets of Nature in order

1. The Life Story of the Cuckoo (1919), 2. The Life Story of the Caddis Worm (1919), 3. The Life Story of the Garden Spider (1919), 4. Hand Versus Feet (1922), 5. Infant Welfare in the Bird World (1922), 6. The Cuckoo's Secret (1922), 7. The White Owl (1922), 8. The Battle of the Ants (1922), 9. Skilled Insect Artisans (1922), 10. Fathoms Deep Beneath the Sea (1922), 11. Studies in Animal Motion (1922), 12. The Comma Butterfly (1923), 13. Winter (1923), 14. Paws and Claws (1925), 15. Seed Time (1926), 16. Busy Bees (1926), 17. The Plants of the Pantry (1927), 18. The Story of a Glass of Water (1927), 19. Plant Magic (1927), 20. Floral Co-operative Societies (1927), 21. The Home Wrecker (1929), 22. The Frog (1929), 23. Scarlet Runner & Co (1929), 24. Playtime at The Zoo (1930), 25. Special Messengers (1930), 26. Mighty Atoms (1930), 27. Plants of the Underworld (1930), 28. Peas and Cues (1930), 29. The Strangler (1930), 30. The Aphis (1930), 31. Friendly Flies (1931), 32. The Light Of Love (1931), 33. In All His Glory (1931), 34. War in The Trees (1931), 35. Magic Myxies (1931), 36. The World in a Wine-Glass (1931), 37. Dream Flowers (1931), 38. The Bittern (1931), 39. Water Folk (1932), 40. The Two Pounder (1932), 41. Great Crested Grebe (1932), 42. The Raiders of The Fens (1932), 43. The Froth Blower (1932), 44. Short Eared Owl (1932), 45. Springtime In The Scillies (1932), 46. Orphans of The Wood (1932), 47. The Nightingale (1932), 48. Nature's Double Lifters (1932), 49. Romance in a Pond (1932), 50. Brewster's Magic (1933), 51. Fit To Boil (1933), 52. Amazing Maize (1933), 53. Brock The Badger (1933), 54. Gathering Moss (1933).

About 6h 50m across 54 released films.

None are listed on TMDB.