The Philadelphia Zoo - Rare Mammal Conservatory

Bats, tree kangaroos, red-capped mangabeys, sifakas, lemurs, giant tree shrews and more are housed in this recently-renovated building.

The lemurs seem to enjoy looking at the visitors as much as the visitors enjoy watching them, but most of the animals in this building go about their daily routines seemingly unaware of the zoo visitors observing them.