The residents and staff of Plymouth Place Senior Living in La Grange Park tagged about 50 monarch butterflies Friday and watched them start their southern migration to Mexico.Before releasing the butterflies, the residents recorded the gender of each butterfly, whether it was raised from a caterpillar or captured in the wild, and the date and location of its release. No compatible source was found for this media.The butterflies were raised on a farm in Wisconsin and shipped to the area overnight, so they spend no more than 24 hours in transit.Throughout the summer, residents . . .