title: Crop volume, nectar concentration and hummingbird energetics.
mesh_terms: D000222:Adaptation, Physiological; D000818:Animals; D001717:Birds / Q000033:anatomy & histology*; D001835:Body Weight; D003426:Crop, Avian / Q000033:anatomy & histology*; D004435:Eating; D005504:Food Analysis; D010101:Oxygen Consumption; D013395:Sucrose / Q000032:analysis; D013696:Temperature
chemical_list: D013395:Sucrose