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they will eat something and then they will turn to a stinkbug over night (not sure but thats what my studies say on stink bugs).
As a stinkbug is an insect, it is an invertebrate. All insects are invertebrates.
Pentatomidae
You can use hot and soapy water to get a stain from a stinkbug off your skin. You can also try and use vinegar.
yes a stink bug is a beetle