AWARENESS OF DIRECTION 



guides, but the gyrations in stormy weather suggest that ducks seek re- 

 orientation when traveling under adverse weather conditions. There is 

 ample evidence that migration does not always carry migrants to their 

 destinations; in bad weather they may be blown far from their course or 

 meet their destruction by accident. In the fall migration of juveniles toward 

 the wintering grounds, vast numbers travel with experienced adults. Other 

 young birds, still wandering randomly, gain temperate regions and win- 

 tering companions under the influence of the air mass in which they travel, 

 such air flow showing a southward trend in autumn; and some few each year 

 drift to Europe or to Siberia, carried there by the streams of wind flowing 

 around the Greenland and the Aleutian low-pressure areas, the transoceanic 

 air currents linking North America with the continents to its east and its 

 west. 



21G 



