Birds sing at a higher pitch in urban noise by Hans Slabbekoorn and Margriet Peet
= Birds sing at a higher pitch in urban noise by Hans Slabbekoorn and Margriet Peet
{c}
{title2=2003}
https://www.nature.com/articles/424267a[Primary publication or institutional full text].
By <Hans Slabbekoorn>, <Margriet Peet>. Nature 424, p. 267, Fig. 1; song frequency and ambient urban noise.