Abstract
The reaction of males of three forest rodent species (Myodes clethrionomys, M. rutilus, Apodemus uralensis) to young animals in comparison with their dimensional characteristics and androgenization level was studied. Demonstration of parental care was detected in males of two vole species (M. clethrionomys and M. rutilus) in case of regular contacts with them (sensitization effect). It was demonstrated that the testosterone concentration in the blood serum, as well as the testosterone content in the testicles of the M. clethrionomys males (demonstrating the parental care), was higher than in the sample of males inclined to infanticide. An increased testosterone content in the testicles and blood serum was also found in the M. rutilus males that had contact with young animas. Neither demonstration of parental care nor significant differences in the testosterone concentration in the testicles and blood serum were detected in the A. uralensis males.
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