Peromyscus maniculatus bairdii

In laboratory tests, least weasels, Mustela nivalis, were more attracted to estrous than diestrous urine of prairie deer mice, Peromyscus maniculatus bairdii. This may increase the weasel s preying chances through the presence of pups in the case of postpartum estrus or estrous females may indicate a higher population density (Cushing, 1984). 

Doty, R. L. (1972). Odor preferences of female Peromyscus maniculatus bairdii for male mouse odors ofP. m. bairdii and P. leucopus noveboracensis as a function of estrous state. Journal ofComparative and Physiological Psychology 81,191-197. 

---