Speciation on Oceanic Islands: Rapid Adaptive Divergence vs. Cryptic Speciation in a Guadalupe Island Songbird (Aves: Junco)
Figure 6
Song spectrograms for representative song types from the three junco lineages.
A. J. h. oreganus, B. J. phaeonotus and C. J. h. insularis. Amplitude (y-axis) is given in KHz, and time (x-axis) is in seconds.