Adult male walruses resting on rocks, Round Island, Bristol Bay, Alaska. The total walrus population in Alaskan 

 waters was estimated at 90,000 by Bureau biologists in 1961. (Photo by Karl W. Kenyon) 



birds and 16 species of mammals liave become ex- 

 tinct in North America since 18-1-i; there presently 

 are 41 species of birds (including 19 Hawaiian) 

 and 31 of mammals in the endangered category. 

 Lists of birds and mammals needing protection, 

 as well as other vertebrate species of North Amer- 

 ica, have been provided, together with distribution 

 maps, notes on habitat requirements, space needs, 

 and other matters by the Bureau's Bird and Mam- 

 mal Laboratories. The current status of endan- 

 gered species of birds was rejjorted by a Bureau 

 specialist in a paper given at (lie annual meeting 

 of the International Council for Bird Preserva- 

 tion, in New York City. If the trend toward 



extinction, in tlie face of a burgeoning population 

 and increasing development of the country, is to be 

 controlled, there is very real need to apply seri- 

 ously all possible effort to matters of basic ecology, 

 population dynamics, decimating factors, and life- 

 history data for all the species concerned. 



ANIMAL DAMAGE CONTROL 



As compedtion between man and wild animals 

 increases, the problems of animal damage inevi- 

 tably become more acute, increasing the need for 

 more selective and ellectivc control measures, 

 whether t lu> pest is bird or nianiniiil or (he damage 

 is to forest, cro]), i':ingeland, stoi'ed goods, or air- 



38 



