From Cornell Lab of Ornithology:
How well do you know your warbler songs? 
From sweet whistles to sharp phrases, spring is full of song—and some of it can be tricky to ID. Test your birding-by-ear skills with our Warbler Song ID Challenge, including tips on mnemonic patterns and helpful sound descriptions that can help you distinguish between sound-alike Warblers!
Whether you’re just starting out or fine-tuning your skills for the spring season, this interactive quiz is a fun way to challenge yourself and improve your sound ID skills.
Ingersoll District Nature Club 