Table 2.

Survey questions assessing the frequency of bipedalism

Question	Response option(s)	Response type
Please select all that apply: I have observed bipedal locomotion in this primate at any point during …	□ This past month □ This past week □ Today □ No bipedal locomotion was observed in any of these timeframes	Multiple choice with multiple answer option
How many times did this primate exhibit this behaviour? Please give us your best numerical estimate if you do not recall the exact number of times. Please also indicate the appropriate timeframe (e.g. ‘X times per day/week/month’).	Open-ended response	Open-ended response
On average, how many steps did this primate take in each instance?	□ 1–3 □ 3–5 □ 5–7 □ 7–9 □ 10+	Multiple choice requiring single response