Warm-up benefit could explain morning birdsong
Dawn tune-up may improve sound for attracting mates
![Adelaide’s warbler](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/08/082316_SM_birdsinging_main.jpg?fit=860%2C460&ssl=1)
WARBLER WARMUP Even in the highly musical species of Adelaide’s warblers, singers aren’t at their best with the first trill of the morning.
Ron Knight/Flickr (CC BY 2.0)