Alien Big Cats

One creature of the (accessible?) wild which, despite having been quite well documented, still remains elusive, is the Alien Bit Cat, which has been regularly reported from all regions of the Earth, and has been most often described as huge and black. This wild cat, often given the label of 'panther' and 'puma' when black, or 'tiger' when striped, and even lion at times, is a figure which haunts every inhabited continent, and is often accompanied by common contemporary legends concerning wild animals that have escaped from a traveling circus, or a military (experimental?) compound or other confining environment. Many apparently reliable witnesses swear that they have seen such creatures, and some local investigations have been carried out, yielding neither firm proof nor adequate explanation of their existence.