How drought drives speciation (IMAGE) University of Massachusetts Amherst Caption Each drought event should increase the beak depth, which should in turn drive changes to the Darwin's medium ground finch song (l). The right panel gives a graphical representation of simulated beak changes and a spectrogram showing the corresponding projected changes in vocal performance. Credit Podos et al. 2024. Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.