Youngman, P. M. 1975. Mammals of the Yukon Territory. Natl. Mus. Canada, Publ. Zool. 10. 

 192 pp. 



Very good general reference with sections on environmental influences, vegetation and refligium effects on 

 mammal distribution. Species accounts have detailed taxonomic synonymies, dot maps, external and skull 

 measurements, and remarks on fossils, habitat, and ecology. For SYNAPTOMYS BOREALIS: distributed 

 throughout the wooded portion of the Yukon. Has external and skull measurements of males (n=18) and females 

 (n=5-6); pelage description. Suggests that S. BOREALIS speciated in a south-western refugium and is a 

 post-glacial immigrant to the north. Collected in the Yukon "between 800 and 6000 ft mostly in bogs and 

 marshes." Stated 10 pregnant females averaged 4.4 (3-6) embryos. 



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