Facts, Tumblr, and Wikipedia: did you know?
 A pill bug (aka roly poly) isn't a bug
 at all. Though commonly referred
 to as such, pill bugs are actually land
 dwelling crustaceans that are much
 more closely related to shrimp and
 crayfish than to any kind of insect
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 PHOTO: WIKIMEDIA CC
did-you-know:

A pill bug (aka roly poly) isn’t a bug 
at all. Though commonly referred 
to as such, pill bugs are actually land-
dwelling crustaceans that are much 
more closely related to shrimp and 
crayfish than to any kind of insect.    Source Source 2