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In a long-term study done in Alaska, Yom-Tov et al. (2005) found that masked shrew body size contradicts Bergmann's Rule. The study, done on 650 specimens and spanning from 1950-2003, examined body size in relation to ambient temperature. Measurements of body weight, and the length of the tail, ear, hind foot, and body were taken. Results yielded that masked shrew body size decreased with latitude and increased with colder January temperature, a trend that opposed Bergmann's Rule. Additionally, it was shown that body and tail length increased with rising temperatures during the second half of the twentieth century. This may be due to higher temperatures increasing the availability of the shrews' main diet.

In a study done in Alaska, Yom-Tov et al. (2005) found that the masked shrew body size contradicts Bergmann's rule, decreasing with latitude and increasing with colder January temperatures. Additionally, it was shown that body and tail length increased with rising temperatures during the second half of the twentieth century. This may be due to higher temperatures increasing the availability of the shrews’ diets. Another hypothesis that was proposed by Yom-Tov et al. (2005) to explain this relationship between body size and ambient temperature relates to predation. A smaller body size may increase access to