An early example of strict liability is the rule Rylands v Fletcher, where it was held that "any person who for his own purposes brings on his lands and collects and keeps there anything likely to do mischief if it escapes, must keep it in at his peril, and, if he does not do so, is prima facie answerable for all the damage which is the natural consequence of its escape". If the owner of a zoo keeps lions and tigers, he is liable if the big cats escape and cause damage or injury.