The bacula of North American sciurids are divisible into six distinct types represented by those of the genera _Spermophilus_, _Marmota_, _Sciurus_, _Tamiasciurus_, _Eutamias_, and _Glaucomys_. [Please select]
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Probably during the long periods in the winter when snow covers the ground the heteromyids and sciurids remain below ground. [Please select]
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_--In discussing the baculum in _Eutamias_ and _Tamias_, it seems desirable to do so in the light of the structure of the baculum in other sciurids. [Please select]
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Pocock (1923:211), however, reviewed the taxonomic literature on sciurids and wrote: "The conclusion very forcibly suggested by the literature of the subject is the untrustworthiness of such characters." [Please select]
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