hunt water rats by the sea and forage on dead fish that have been washed ashore. Near human habitation, they can also steal shoes and chew on them, and eat the legs of otherwise robust sheep that have slipped in wooden shearing sheds, leaving their legs dangling below. Other unusual matter observed in devil scats includes collars and tags of devoured animals, intact echidna spines, pencil, plastic and jeans. Devils can bite through metal traps, and tend to reserve their strong jaws for escaping captivity rather than breaking into food storage. Due to their relative lack of speed, they can not run down a wallaby or a rabbit, but they can attack animals that have become slow due to illness. They survey flocks of sheep by sniffing them from away and attack if the prey is ill. The sheep stamp their feet in a show of strength. Despite their lack of extreme speed, there have been reports that devils can run at for , and it has been conjectured that, before European immigration and the introduction of livestock, vehicles and roadkill, they would have had to chase other native animals at a reasonable pace to find food. Pemberton has reported that they can average for "extended periods" on several nights per week, and that they run for long distances before sitting still for up to half an hour, something that has been interpreted as evidence of ambush predation. Devils can dig to forage corpses, in one case digging down to eat the corpse of a buried horse that had died due to illness. They are known to eat animal cadavers by first ripping out the digestive system, which is the softest part of the anatomy, and they often reside in the resulting cavity while they are eating. On average, devils eat about 15% of their body weight each day, although they can eat up to 40% of their body weight in 30 minutes if the opportunity arises. This means they can become very heavy and lethargic after a large meal; in this state they tend to waddle away slowly and lie down, becoming easy to approach. This has led to a belief that such eating habits became possible due to the lack of a predator to attack such bloated individuals. Tasmanian devils can eliminate all traces of a carcass of a smaller animal, devouring the bones and fur if desired.