hualpa had been generous enough to make them free of the countryside , hunting , but while there were enough llamas running wild and untended to feed the dragons to their satisfaction , there was no such easy source of leather : they had not even a single leatherworker left , of their ground crews , and the nearest thing was one old round-bellied sailor who vaguely remembered a childhood 's apprenticeship to a tanner , of a few months ' duration .