When invasive plants and animals crowd out native species—and you just can't beat 'em—you might as well eat 'em! That's Joe Roman's argument. It's not a perfect solution, but from lionfish in the Caribbean to the snails and weeds in your backyard, chefs and foodies are serving up invasive species in the name of conservation. Enjoy this short bonus episode from Constant Wonder! Guest: Joe Roman, conservation biologist and research affiliate at the University of Vermont; author, "Eat, Poop, Die: How Animals Make Our World"