1.   In what has become one of the great mysteries of science, the butterfly colonies that return here are three generations removed from the ones that left.

2.   Neighbors and amateur naturalists campaigned to save the butterfly colonies and won.

3.   Scientists say that the growing isolation of the preserves is affecting the health of the larger ecosystem on which the butterfly colonies depend.

4.   The butterfly colonies there have since moved or disappeared.

5.   They want tourism better regulated and the watersheds on which the butterfly colonies depend protected.