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Hint #1:
It's a box about 35 cm tall, 20 cm wide, and 8 cm deep.
Hint #2: It's got a piece of wire mesh (hardware cloth) nailed near the
bottom edge, against the back panel.
Hint #3: It's available commercially.
 A.
A vitamin "lick" for deer, used in areas
where deer reportedly suffer a health-threatening deficiency in Vitamin
A
B. A "night registration" board used in
campgrounds and RV parks
C. A Mediterranean fruit fly trap, used in areas
where these insects cause crop damage and need to be counted to determine
the level of infestation
D. A "bat house" (like a bird house, except
for bats)
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What IS This Thing?