back to the above(wife had to use the comp)from what i was told, in the winter when the good foods gone the rabbits have to dig up roots etc, now in pine wood forest areas i forget what chemical name/ make up/ bla bla, but something in the pines, slows the bunny,s livers metabolic rate down so it cant cope as well with parasites it wouldnt normally have a problem with in warmer weather, the same thing affects ducks, but in ducks shows as white strands in the muscle tissue, before i was aware of all this information i must admit i ate lots of these critters, both flying and digging, .i used to skin them in the dark after a lamping sesh, so didnt see their innards . It was only after the farmer phoned for me to hit them in the morning when they were at their peskiest on the veg patch, So i had a bit of a rude awakening, there is an easy cure for these infected bunny,s though .speeding up the livers metabolism, .Something that naturally occurs in spring-a change of diet and warmer weather.hope this helps,,,and if it helps i was living off rabbits and ducks all the while ,but do look into the affects this can have on you i never did and its too late now...but that was twenty years ago