The Monarch is a large, conspicuous butterfly easily recognized by most people, although sometimes confused with a mimic, the smaller Viceroy. Robert Michael Pyle wrote an interesting book (c 1999) called "Chasing Monarchs" in which he attempts to follow the western Monarchs as they migrate in the fall. It is a travelogue / personal narrative sprinkled with a lot of Monarch information.
Note: This is a personal web site and is not affiliated with the National Park Service or Guadalupe Mountains National Park. Contact information for the author, Ron Lyons, is accessible through the Index Page referenced below. Thank you.