A spotted bat has large ears relative to its size. Its back is black while its underside is white. Every spotted bat has a white mark on each shoulder and on its rump. Both ears and wings are pinkish.
A spotted bat is typically 4 to 4.5 inches long with a wingspan of 14 inches. It weighs 0.6 to 0.7 ounces.
These bats have other characteristics that help identify them. For instance, unlike similar species, spotted bats are loners. While they rest, their ears wrap around their heads. As a bat starts moving around, its ears fill with blood, and they unfurl.