In article ,
says...
If the container isn't made out of metal or glass, the larvae will chew
through it or so I'm told.

Can't say I have ever seen them chew through plastics,
even zip-lock bags. Have seen different type of weevils
cut through baggies.
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http://home.comcast.net/~larflu/owl1.jpg

Lar. (to e-mail, get rid of the BUGS!!