In honor of National Bird Day, here's a re-share of a 2016 video that Dale's Tim Brown put together while recording some birds out in the field.
This video is proof that one of the best (and cost-effective) ways to improve the sound of your mobile recordings is the MightyMic S from Ampridge.
The first recording is with the iPhone 6s built-in mic and the second recording is with the MightyMic S. Listen close and you'll hear less noise and more focus.