While all forms of wild game were popular among those who could obtain it, most meat came from domestic animals. Domestic working animals that were no longer able to work were slaughtered but not particularly appetizing and therefore were less valued as meat. Beef was not as common as today because raising cattle was labor-intensive, requiring pastures and feed, and oxen and cows were much more valuable as draught animals and for producing milk. Mutton and lamb were fairly common, especially in areas with a sizeable wool industry, as was veal. Far more common was pork, as domestic pigs required less attention and cheaper feed. Domestic pigs often ran freely even in towns and could be fed on just about any organic waste, and suckling pig was a sought-after delicacy. Just about every part of the pig was eaten, including ears, snout, tail, tongue, and womb. Intestines, bladder and stomach could be used as casings for sausage or even illusion food such as giant eggs. Among the meats that today are rare or even considered inappropriate for human consumption are the hedgehog and porcupine, occasionally mentioned in late medieval recipe collections. Rabbits remained a rare and highly prized commodity. In England, they were deliberately introduced by the 13th century and their colonies were carefully protected. Further south, domesticated rabbits were commonly raised and bred both for their meat and fur. They were of particular value for monasteries, because newborn rabbits were allegedly declared fish (or, at least, not-meat) by the church and therefore they could be eaten during Lent.