weird crontab entries in system logs

[Pollywog <pollywog@shadypond.com>]

A few minutes ago, I started getting this about every five minutes.  My
/etc/crontab has not been changed, so I am stumped

> Unusual System Events
> =-=-=-=-=-=-=-=-=-=-=
> Jun 27 19:40:32 lilypad /usr/bin/crontab[7692]: (root) LIST (root) 
> Jun 27 19:40:32 lilypad crontab[7695]: (root) REPLACE (root) 


Any ideas about what is going on?

--
Andrew