"Kimberella" probably grazed on microbial mats, but a selective predatory habit cannot be ruled out. Fedonkin reckons that as it ate, it moved "backwards"; the trail thus created was destroyed by the subsequent grazing activity. Conversely, Gehling et al. claim that it moved 'forwards'. Fans of grooves are often found radiating from the "head" end of the organism; these indicate that the organism stayed in one place, and raked the surface of the microbial mat towards it by extension of its head, which bore two "teeth". Gehling "et al". reconstruct Kimberella as having a long neck that operated like the arm of a digger, rotating about an axis perpendicular to the sea floor in order to produce the sweep of the fan, and rotating towards and away from the animal to scrape food from the substrate to the mouth. In one community Kimberella has been shown to be avoiding its grazing traces, demonstrating complex sensory behaviour.