Once the male makes contact, he mates for up to 12 hours with several female mice and having given his all, dies.

It would not do for his fighters to see their leader vanquished by a small female mouse.

The eggs were then transferred into female mice and allowed to develop as natural fetuses.

No difference in muscle damage was observed between male and female mice.

This same chemical has been shown to cause weight gain in female mice when exposed during neonatal development.

The researchers have yet to report on the behavior of female mice lacking estrogen receptors.

The major character of Hannah the female mouse was added for the series.

Data from the male and female mice were pooled because there was no significant difference between the two groups.

This is then implanted in the womb of a third female mouse.

But the female mice instead died, as did many of those vaccinated to resist mousepox.