Robber and pollinators of T. undulata.

(A) The robber (Nectarinia asiatica) consuming nectar by piercing through the corolla tube, and (B) through the opening of the tube. (C & D) The two pollinators - Pycnonotus leucotis and Pycnonotus cafer legitimately forage the flowers and facilitate pollination. Inset of (A): Note the hole (arrow) in the corolla tube made by the robber.