noun
baiji; Chinese river dolphin; Yangtze dolphin
Refers to the freshwater dolphin Lipotes vexillifer, native to the Yangtze River; critically endangered and possibly extinct.
ヨウスコウカワイルカは、長江に生息していた淡水イルカです。
The baiji was a freshwater dolphin that lived in the Yangtze River.
General term for river dolphins; ヨウスコウカワイルカ specifically refers to the Yangtze species.
From 揚子江 (Yōsukō, 'Yangtze River') + 河海豚 (kawairuka, 'river dolphin'). The katakana spelling is standard for species names.