Rusty-spotted cats (Prionailurus rubiginosus) Invisible! This is the world's smallest cat and only 10 photos have been taken of it in the wild! They can be found in only 7 zoological parks in the world and the Parc des Félins is amongst those who breed them on a regular basis. The rusty-spotted cat rivals the black-footed cat as the world's smallest wild cat. It weighs only 0.9 to 1.6 kg. The short fur is grey over most of the body, with rusty spots over the back and flanks.