robozilla is a web crawler written to check the status of all sites listed in dmoz. periodically, robozilla will flag sites which appear to have moved or disappeared and editors follow up to check the sites and take action. this process is critical for the directory in striving to achieve one of its founding goals: to reduce the link rot in web directories. shortly after each run, the sites marked with errors are automatically moved to the unreviewed queue where editors may investigate them when time permits.