Spontaneous quantity discrimination in Sleepy lizards

In this study, we tested 8 Sleepy-lizards (Tiliqua rugosa asper) on their ability to spontaneously choose the larger of two quantities based on continuous or discrete information. We recorded the lizards' identity, weight (g) and snout-vent length (mm). As we tested lizards in two batches (groups), we also recorded if they belonged to group A or B. In regards to the experiment, we recorded session (day), trial (1-12), stage (preference test or quantity discrimination), date of the test day and start time of the first trial, the test (continuous or discrete) and the comparison. We measured lizards' choice behaviour by recording the choice of the quantity as well as a binary version that represented the choice of the larger quantity as 1 and the smaller choice as 0. Finally, we also quantified the time it took lizards to make a choice from trial videos in seconds (latency). NA values indicate either no data or no choice. We analysed the choice behaviour using the binary choice data and al...