Burke thought they looked like giant mice at first — but as she got closer ... to discover the true identity of the intruders — baby squirrels. “What was really odd was how unafraid they ...

The experiment was repeated 630 times. Although most of the pregnancies failed, seven healthy mice were born. Each of those seven baby mice had two biological dads. This would allow same-sex ...

This article was originally published with the title “ The War Against Field Mice in France ” in Scientific American Magazine Vol. 109 No. 6 (August 1913), p. 114 doi:10.1038 ...