









f 





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Chemosterilants screened by Bureau chemists promise a humane method of animal control without the use of poisons 

 or traps, and with savings in time and cost. (Photo hy E. P. Uaddon) 



through the dense growth of Scaevola to provide 

 access to birds scheduled to be removed during the 

 nesting season of 1963-64. The 750-foot bound- 

 aries were clearly marked so that none of the birds 

 nesting outside the construction area would be 

 sacrificed in t lie limited control action planned. 



Wintering waterfowl in Mexico 



Tabulation of waterfowl band recoveries at the 



Patuxent Center has shown clearly that the heav- 

 iest hunting pressure in Mexico is from Baja Cali- 

 fornia south to Nayarit. This reflects the influx 

 of American hunters into these nearby areas more 

 than it docs the location of wintering waterfowl 

 concentrations in the region. The January aerial 

 surveys made since 1948 show thai Mexican water- 

 fowl are distributed as follows in the winter: 

 Pacific coast, II percent, East coast, '56 percent, 

 and interior Mexico, -JO percent. 



Studies on diseases common to man and animals 



Collaborative programs on diseases common to 

 man and wild animals are being conducted at the 

 Patuxent Center. The National Institute of 

 Neurological Diseases and Blindness, of the Na- 

 tional Institutes of Health, is collaborating in this 

 field in relation to slow-acting viruses of animals 

 and man; the Armed Forces Institute of Pathol- 

 ogy, Division of Geographic Pathology, in rela- 

 tion to trypanosome infection in raccoons and 

 various filariid worms of other animals; and the 

 Johns Hopkins University School of Hygiene and 

 Public Health, Department of Pathobiology, in 

 relation to infections of the respiratory systems 

 of various wild animals. 



Rare geese from Buldir Island 



The Aleutian Canada goose, Branta canadensis 

 li ucopareia, formerly occurred widely along the 



