Did you know?
The nine-banded armadillo nearly always gives birth to identical quadruplets! If she has a hard time telling them apart, don’t blame her: she has her hands full!
Fact and sketch contributed by Amelia Munson
Stockard, C. R. (1921). A probable explanation of polyembryony in the armadillo. The American Naturalist, 55(636), 62-68.
Hamlett, G. W. D. (1933). Polyembryony in the armadillo: genetic or physiological?. The Quarterly Review of Biology, 8(3), 348-358.