Before revision:  Here we show that the optimality of inverse-square L\'evy walks in two-dimensions becomes striking when targets are sparse and unpredictable in size, and when detection is weak. Specifically, we prove that under the intermittent model, in which detection is not possible while moving ballistically B\'enichou et al.
After revision:  Here we show that the optimality of inverse-square L\'evy B\'enichou et al.