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S02E01: Why Do Birds Sing?NOVA travels to forests and marshes to discover why birds sing and finds surprising parallels with the acquisition of speech in humans.
Genres:
Air Date:
Nov 03, 1974
Runtime:
55 minutes
Production:
Casts:
- Season 1
- Season 2
- Season 3
- Season 4
- Season 5
- Season 6
- Season 7
- Season 8
- Season 9
- Season 10
- Season 11
- Season 12
- Season 13
- Season 14
- Season 15
- Season 16
- Season 17
- Season 18
- Season 19
- Season 20
- Season 21
- Season 22
- Season 23
- Season 24
- Season 25
- Season 26
- Season 27
- Season 28
- Season 29
- Season 30
- Season 31
- Season 32
- Season 33
- Season 34
- Season 35
- Season 36
- Season 37
- Season 38
- Season 39
- Season 40
- Season 41
- Season 42
- Season 43
- Season 44
- Season 45
- Season 46
- Season 47
- Season 48
- Season 49
- Season 50
- Season 51
