The tunnel stalker was a gigantic desert Rahi from Po-Metru known for its unusual hunting technique. The stalker lurked in tunnels just below the sand, with its bladed tail poised to strike. When it picked up movement from above, it lunged up through the ground and trapped whatever luckless creature was going by. Only two specimens of tunnel stalker were ever seen in Metru Nui, one of which was captured by the Vahki and put in the Archives. Tunnel stalkers made scattered appearances in Po-Wahi. In addition to its tail, the tunnel stalker could rely on sharp pincers and mandibles to defend itself.