I accidently locked a boomrat in a room I build to protect one of my geothermal reactors. I was curious to see if it's exploding when it starves. But when the foodbar was empty, its regeneration rate was higher then his health-loss because of starvation and it didn't get incapacitate. I know that this is not a major problem but I think it's worth a look.
indeed a bug
thanks for reporting.
http://ludeon.com/mantis/view.php?id=315