49 



supply. This, coupled with inherited memory, probably more than any- 

 thing" else, controls the migration of birds. Do all birds migrate in the same 





7^ >> <,' ^-v 



|l|3ll32ffi3:^#S^^^^^^^f5^ 



Fig. 59. The flight of the ducks. ^ 



manner? No. We have all seen Swallows gather together in immense 

 flocks before leaving us. There are others again, such as the Cuckoo, 



which quietly steal away in pairs, 

 or in very small flocks. Some 

 birds in their flight remain close 

 to the earth, while others fly at 

 such a height that they remain 

 unseen to the naked eye. Some 

 move mostly at night, others in 

 the daytime. Some birds migrate 

 to the south, leaving their young 



'•/'. 



Fig. 60. The Meadow Lark. 



to follow them at a later date. 

 In most cases the males precede the 

 females by some days in their return to 

 us in the spring. 



Before the snow is gone, we may 

 hear the shrill piping notes of the 

 Horned Lark coming from the plowed 

 fields and meadows. The sound is not 

 altogether unlike the pleasant note of 

 the Meadow Lark. Early in March, the 



sharp-eyed, cunning old Crow bids good-bye to the southern parts of 

 the Province and moves northward, with his head filled with new 

 4-124 



Fig. 61. The return of the Crows. 



