Figure 15. Evidence of wandering during migration. Map shows northward dispersal 



of fall migrant Blue-winged Teal during the same autumn as they 



were banded at McGinnis Slough. 



tions south of the breeding range indicate that even after ducks have gained 

 the southland, many individuals, some of them adults, continue their ran- 

 dom travels. Vogt (1934:268) drew attention to this when he found that 

 some autumn-banded waterfowl were killed the same season in Ontario, 

 Maine, and at other places far north of his banding station on Long Island. 

 Mann and his cooperators (1947) observed the same thing to be happening 

 with many of the ducks that stopped at McGinnis Slough. Of 141 direct 

 Blue-winged Teal recoveries, 28 bluewings, or 20 per cent, were killed 

 north of McGinnis Slough (Figure 15). Five of these were adults. Pirnie 

 (1941:258) found that "in their fall dispersal from southern Michigan, some 

 Black Ducks and Mallards travel as far as two hundred or more miles west, 

 north or east." Intensely interesting is the "explosion" of Ring-necked Ducks 

 shown by Duvall (1949). Banded in southern Louisiana in November and 

 December, some were recovered west in Texas, north in Tennessee, and east 

 in Georgia and Florida before the end of the same year. Redheads that 

 were banded during the summer in Utah were found by Robbins (1949) 

 to fan out into eight more northern states and one Canadian province. Mann 

 (1950) gives a picture of a spectacular October shift of waterfowl from the 



" A "direct recovery" is one in which the band is recovered during the same year the bird 

 was banded. 



112 



