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Bittern - Wikipedia
American Bittern Identification - All About Birds
American Bittern | Audubon Field Guide
American Bittern - All About Birds
American bittern - Wikipedia
American Bittern Life History - All About Birds
BITTERN中文(简体)翻译:剑桥词典 - Cambridge Dictionary
American Bittern - eBird
Bittern | Migratory Wading Bird of Europe & Asia | Britannica
American Bittern - American Bird Conservancy