Reacción a "Footprints of coexistence of different hominids described in Kenya 1.5 million years ago"

I find the article very interesting in two different aspects. It demonstrates the sympatry of two species of hominins (presumably Paranthropus boisei and Homo erectus) and indicates that one of them (P. boisei) had a more mobile and divergent big toe (i.e. a more primitive and less efficient bipedalism) than the other (H. erectus, better designed for long distance walking and running).  I will explain it to my students in class! This paper represents a big step forward.