Fig. 2. Example of a respirometric record for a foraging ant at 1.18 µl min^–1 and 30% sugar concentration food source. CO₂ production rate (in µl h^–1) is plotted as a function of time. There are three different parts: (1) before drinking (ca. 4 min), (2) while the ant drinking at the feeder (between arrows) and (3) after feeding (also ca. 4 min).