Yoplait and McDonald's didn't respond to The Dodo's request for comment, but Wilczak says the warning label was a direct result of her persistent campaigning.
"In my opinion that is not good enough," she says. "People need to express their disapproval of harmful, profit-making designs."
Indeed, since she started rehabbing skunks and raccoons in 2002, she sees at least four babies every year who are in the deadly clutches of a plastic container.
Despite the printed warning, the containers can still be seen casually discarded pretty much everywhere.
"Far too many [animals] are never found," Wilczak says. "Generally, when any wild animal realizes it is compromised it will seek shelter, hiding away from predators - and die in silence and long suffering."
Like Wilczak, we've also heard this sad story before.
Last July, The Dodo reported on another skunk in similar straits. And it happens to squirrels and other babies in the wild too.