1977] 
Kanz — Monarch Butterfly Orientation 
131 
g h i 
Fig. 5. Release orientation for summer monarchs on clear days. For each circle: 
Dot indicates the vanishing direction of a butterfly; star indicates sun position at the 
time of release; radial arrow indicates direction in which wind was blowing and its 
velocity in miles per hour; N indicates true north. Most vanishing azimuths are 
seen to be down-wind. 
