The tasks are easy enough that a child should be able to solve them1, and many related experiments have been passed by animals (including shrimp!). However, these tasks are still challenging for AI, even in light of recent progress. We believe that solving these common-sense reasoning tasks is the next step towards creating general intelligence and that this testbed can facilitate progress.
Animal videos and cylinder experiment discussion: MacLean et al. The evolution of self-control PNAS (2014)
1 This site is designed to help test this hypothesis!