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. Author manuscript; available in PMC: 2010 May 16.
Published in final edited form as: Behav Brain Res. 2008 Dec 25;199(2):340–344. doi: 10.1016/j.bbr.2008.12.019

Figure 1.

Figure 1

Proportions of males exhibiting Parental or Nonparental behavior. Approximately fifty percent of adult, virgin, male C57Bl/6 mice exhibited parental behavior towards an unfamiliar infant. The propensity to express parental behavior was not altered by prior treatment with progesterone either 5 days ( χ2 test, p = 0.76) after removal of the hormone capsule. Data are presented as percentage of each group; numbers inside each bar are the numbers of individuals exhibiting each type of behavior.