

夕方になると、コウモリが飛び始めます。
暗いトンネルの中にコウモリがいました。
コウモリは鳥じゃないって知ってた?
"コウモリ" is in the lesson "Small birds" (Level 10), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.