• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

• Top
• 2 · Nature
• 25 · earth, world as celestial body
• 25F · animals
• 25F3 · birds
• 25F32 · song-birds
• 25F32(...) · song-birds (with NAME)
• 25F32(SWALLOW) · song-birds: swallow
• 25F32(SWALLOW)(+4) · song-birds: swallow (+ animal behaviour)
• 25F32(SWALLOW)(+42) · song-birds: swallow (+ feeding and care of young)

25F32(SWALLOW)(+421) · song-birds: swallow (+ nest, den, burrow)