Figure 1 shows the taste responsiveness of the three lemurs to various concentrations of sucrose, fructose, glucose, maltose and lactose when tested against tap water. Taste preference thresholds were found to be 25-50 mM for sucrose, 25-50 mM for fructose, 75 mM for glucose, 50 mM for maltose and 50 mM for lactose. Preference thresholds for sucrose and fructose revealed a degree of inter-individual variability, with one or two individuals scoring a lower threshold value than the other individual(s).

Figure 2 shows the mean preference (+SD) of the three lemurs when given the choice between two aqueous saccharide solutions presented at equimolar concentrations of 50, 100 and 200 mM, respectively. At all three concentration levels, the lemurs significantly preferred sucrose over all other saccharides and fructose over glucose, maltose and lactose. However, tests between glucose, maltose and lactose did not show consistent preferences across the three tested concentration levels. For example, at the highest concentrations (100 mM and 200 mM) all three lemurs significantly preferred glucose over lactose and maltose over lactose. Only S2 showed a significant preference for maltose over lactose at 50 mM while the other two lemurs showed non-significant tendencies to prefer maltose over lactose at this concentration