Sezon 11
Bölümler
1 Episode 1 11 Haz 1973 2 Pajaten 24 Haz 1973 3 Lapwing 1 Tem 1973 4 Bird's Eye View of London 15 Tem 1973 5 Do Not Disturb 22 Tem 1973 6 A Wealth of Wildfowl 29 Tem 1973 7 Aldabra Reprieved 5 Ağu 1973 8 The Empty Desert 12 Eyl 1973 9 Episode 9 19 Eyl 1973 10 The Floating Worlds of Naivasha 26 Eyl 1973 11 Trail of the Snow Geese 3 Eki 1973 12 Arctic Summer 10 Eki 1973 13 Land of the Loon 17 Eki 1973 14 Central Flyway 24 Eki 1973