By late May each year, monarch butterflies (Danaus plexippus) return to the Berkshires from their winter home in the oyamel fir forests in the Sierra Madre Mountains of central Mexico, ...

The McKellar Island Bird Observatory in Thunder Bay, Ont., has planted more than 150 milkweed plants to help revive the monarch butterfly population. The effort was in honour of Canada 150 ...

During a recent show, SciFri’s Flora Lichtman discussed monarch butterflies with ... While the toxins don’t harm the butterflies, they taste bitter and can cause vomiting in birds that chow on ...