Correction to: Scientific Reports https://doi.org/10.1038/s41598-019-42233-7, published online 07 May 2019

This Article contains a typographical error in the Introduction.

“Singing is largely but not exclusively seasonal, its occurrence increasing in fall feeding grounds, peaking during winter migrations and assembles, and decreasing in the spring3-8.”

should read:

“Singing is largely but not exclusively seasonal, its occurrence increasing in fall feeding grounds, peaking during winter migrations and assemblies, and decreasing in the spring3-8.”

In addition, this Article also contains an error in the Results section, under subheading ‘Presence of phrases’.

“In 2013, the year of most similarity, four (Phrases 3, 4, 5, 6,) of a total of eight phrases (50%) were shared in all four populations.”

should read:

“In 2013, the year of most similarity, four (Phrases 3, 4a, 4c, 6) of a total of eight phrases (50%) were shared in all four populations.”