There was a write up about Don Davis's semi-roundtrip tag recovery on Journey Northhttp://www.learner.org/jnorth/tm/monarc ... onBio.html
"A tagged male monarch (Danaus plexippus), released by Donald A. Davis (Canada) at Presqu'ile provincial Park near Brighton, Ontario, Canada, on 10 September 1988, was recaptured on 8 April 1989 in Austin, Texas, U.S.A., travelling an estimated 2880 miles, making this the World's Longest Butterfly Migration."
Also a photo of Don standing in a logged clearing in the Chincua overwintering site forest in Mexico:http://www.learner.org/jnorth/images/gr ... 6_0219.jpg
The monarchs LOVE to form their clusters along the edges of logged clearings because that way they can gain access to the sun. The monarchs are also more exposed to subfreezing temperatures, but the physiologically based survival need to have access to the sun trumps the the need to have maximum shelter from infrequent serious freezes. So small clear cuts and forest thinning doesn't cause the butterflies to be more exposed, because butterflies WANT to be more exposed. California researchers understand this principal and that's why they have sometimes deliberately logged holes in monarch overwintering groves to improve the habitat.