The Minnesota Department of Natural Resources has a request for their state's constituents: stop stocking your outdoor ponds with American bullfrog tadpoles. The American bullfrog (Rana catesbeiana), while native to the US, are only considered native in the far southeast part of Minnesota. Recent surveys have shown new naturalized bullfrog populations showing up all over the state. Part of the reason for this is likely that pet shops, nurseries and other sources for water gardening supplies are selling the tadpoles illegally. Though the darn things can still be sold legally, without a permit, for bait, which doesn't make sense to me given this dire-sounding press release.