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- Lectures and lecturing 10
- Herons 3
- Cormorants 2
- Ducks 2
- Grebes 2
- Gulls 2
- Pelicans 2
- Plovers 2
- Sandpipers 2
- Anas 1
- Avocets 1
- Black-crowned night heron 1
- Coyote 1
- Curlews 1
- Dams 1
- Geese 1
- Hunting 1
- Ibises 1
- Motion pictures 1
- Nature films 1