Bt Corn and the Monarch Butterfly
http://biotechknowledge.com/biotech/knowcenter.nsf/f055f4dc645999ad86256ac4000e6b68/0231086dd38f9a3d
Monsanto provides links to articles about the effects of biotech corn on the Monarch butterfly population.
Monarch Watch : Education, Conservation and Resear
A cooperative network of students, teachers, volunteers and researchers dedicated to the study of the Monarch butterfly and its fall migration to Michoacan, Mexico.