killing the main source of food, milkweed. there used to be a lot of milkweed in corn and soybean fields. but as farmers changed their wheat control methods that milk weed disappeared. because much of the breeding rain of monarchs is used for farming, a lot of that habitat is gone now. reporter: experts say there are still ways to protect them, from planting native milk weed and neck for flowers, reducing pesticide use, and supporting conservation groups. but these things must be done quickly if the butterfly is to be saved. now formally one step further on a path toward extinction. matt rivers, cnn, mexico city. that wraps this hour of cnn newsroom. i m kim brunhuber and i ll be back in just a moment with more news. please do stay with us.
One of our favorite winged visitors is now on the endangered list as numbers of this beautiful orange and black butterfly have dwindled over the years.