 They use the wings to make an active flight, not to fall into the sea, and probably use also the wings to climb up a little bit on altitude for those ascendant winds, and just to rest while the winds are favorable. Gerard, I gather you saw about 10 butterflies on this beach that morning in French Guiana. Do you think that they were blown off course and they weren't intending to be there, or is this evidence of an intentional larger migration?