Only two armadillo species, the southern three-banded and the Brazilian three-banded, roll into a ball if threatened. The International Union for the Conservation of Nature assesses the Brazilian ...

(WBOY) — West Virginia has its own share of strange animals, but a type of armadillo could be next ... nine-banded armadillos do not roll into a ball, but instead dig burrows to escape predators.

How gravity causes a perfectly spherical ball to roll ... the time period of rolling diverges, or increases to infinity, near the transition, and how the system settles into a stable rolling ...