NATURE'S REVIVAL 19 



marsh. This returning wanderer should be welcomed 

 for the great range of his travels. Not content with 

 seeking a comfortable climate for the winter, his 

 restless spirit impels him to go on southward 

 through Mexico and along the isthmus into South 

 America, and across the equator to where the months 

 of northern winter bring a rising temperature. The 

 insatiable energy shown in his swift, eager run along 

 the shore, his cries of alarm when taking wing, his 

 unending calls and sustained flights reveal the spirit 

 that prompts his long southern journey. 



Spring recalls the peculiar ways of our migrating 

 visitors. We have some that travel in an indifferent 

 way, varying their habits with the season's tempera- 

 ture. They merely grow less numerous toward the 

 north in winter, while appearing in greater numbers 

 in the warmer zone. Excessively cold winters bring 

 down the Purple and Evening Grosbeaks, the Canada 

 Jay, and Snowy Owl from their northern retreats. 

 Some, like the Robin, leave an occasional straggler 

 behind all winter, while the majority spend the 

 season in the Southern States. There are Plover that 

 go to the extreme limit of Patagonia, returning in 

 response to the same strange impulse to breed within 

 the arctic circle. There are Waders that migrate with 

 a regularity that would suggest a personally conducted 

 tour or some kind of systematic organisation. Some 

 aquatic birds have very irregular habits, depending 



