Denise,
    I have not heard of possums behaving this way, but it is common for
skunks to scratch at a hive entrance and consume the bees as they defend the
hive.  I wouldn't put it past Mr. or Mrs. Possum to have learned the same
trick..  The solution for skunks ( and quite possibly possums) is to elevate
the hive on a platform at least 18 inches high, keeping bees out of reach.
It's great for your back, too!  As an alternative, you could trap and
relocate the possum. An electric fence around your hives would do the
trick..  I use a solar powered unit myself.  The fence works to keep racoons
and skunks out of my corn as well!  Good Luck!

Bill
Willits, CA

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