11.   We were glad it was so easy to drop the top, given that we had to move fast when nature called for our rookie teen-age campers.

12.   When nature calls, you answer.

13.   When nature calls, the anchor is weighed and a landing made.

14.   When nature called, we grabbed a trowel and a roll of toilet paper and headed into the desert to do our thing and hide the evidence.

15.   Especially when nature calls in an amorous way.

16.   For the others in the village, when nature called, there were some secluded spots in their fields or the river flowing through the village.