Insectivorous bat heads and a “red flying lemur bat” [a species of gliding lemur, now commonly known as the colugo]
Though currently believed to have evolved from insectivorous land mammals, such as shrews, the insectivorous bats were once thought to be most closely related to the “flying” lemur, also known as the colugos.
Flying lemurs can’t fly (as they glide like flying squirrels and flying phalangers), nor are they true lemurs, but they’re currently believed to be the closest extant relative of the True Primates and Treeshrews (which, incidentally, are not closely related to the ground shrews that the insectivorous bats are related to).
The Animal Kingdom, Arranged According to its Organization. Serving as a Foundation for the Natural History of Animals and an Introduction to Comparative Anatomy. Baron Cuvier, 1837.