Hemodynamic papilla erection and hydrostatic tongue elongation likely increase the nectar gathering ability of G. soricina. The volume of nectar collected during lapping is directly related to the length and radius of the tongue tip, as well as the thickness of the adhered-nectar layer (10). Hydrostatic tongue elongation increases the length of the tongue tip and hemodynamic papilla erection increases the thickness of the adhered-nectar layer. This adhered-nectar layer is quite thick for G. soricina because it is determined by the length of the elongated hair-like papillae and, therefore, extends beyond the surface of the tongue. It is likely that the hemodynamic nectar mop helps G. soricina take advantage of limited nectar resources to fuel its energy intensive lifestyle (11, 12).