Jane We have also experienced a few hives which are very thorough about chewing up and discarding such cardboards (not usually sticky boards since we cover them with wire mesh). We were inserting veg oil soaked corrugated cardboard at 7 day intervals. In most cases the 5 inch squares were mostly unchanged, or nibbled a bit at the corners. (A beekeeper did this on a larger scale, then abandoned it. We have found those squares nearly like new after a year.) A few colonies however, attacked the cardboard and all that was left in 7 days was the shreds on the bottom board. Many bees must have been involved. I wonder if the behavior is correlated with brood removal hygenic behavior. Kerry Clark, Apiculture Specialist B.C. Ministry of Agriculture 1201 103 Ave Dawson Creek B.C. V1G 4J2 CANADA Tel (604) 784-2225 fax (604) 784-2299 INTERNET [log in to unmask]