“…However, White-crowned Sparrows inhabit dense vegetation (Sandoval and Mennill, 2012), and increasing the song minimum frequency to avoid overlap with background noise, could increase the attenuation of high frequencies in this habitat (Wiley and Richards, 1978;Marler, 2004). Therefore, species that inhabit dense vegetation with high anthropogenic noise as singing mice, frogs, or crickets (Van den Bergh and Kappelle, 1998;Savage, 2002;Bailey, 2005) may not increase the minimum frequencies of their vocalizations because this will affect the song transmission and communication with other individuals.…”