Figure from Hewes et al., 2022. It shows the morphological correlates of different stages of nectar feeding on birds. Hummingbird skull modified from 3D surface model of Florisuga mellivora specimen (YPM VZ YPM ORN 101545, Yale Peabody Museum). Wing bones and muscles from Mason Friedman (Behance, Major Flight Muscles of the Hummingbird) and Warrick et al., 2012. Digestive and renal anatomy from Tell et al., 2021.