My BP has now not eaten in 13 months. He is about three years old. He used to eat reasonably regularly, but would stop every so often for up to a few months. He started on mice and was up to small/medium rats (always frozen-thawed) before he stopped.

Temps and humidity are fine. He had a perfect shed a couple of weeks ago, which was his first since February. He is currently quite active (for a BP) but does go through periods of minimal activity. He weighs 486g, so he's not a large BP, but he has lost almost no weight since he stopped eating. He is still healthy looking.

I have not yet tried any particular feeding techniques, apart from the usual: present warmed-up rat with tongs and jiggle it around a bit. Sometimes he will come check it out, other times he completely ignores it, but since November 2007, he has not struck at it.

Surely at this stage, I should be getting worried...?

As always - any advice greatly appreciated. Thank you.