 Families may hire other relatives or strangers if faced with a large order.However, only the most established of carving families can have any permanent outside help and a number of these refuse to hire outsiders.Almost all alebrije carvers in Oaxaca use the wood of trees from the genus "Bursera" (Family Burseraceae), with a preference for the species "B. glabrifolia", which is locally called copal or copalillo.