A seven-year-old boy has been filmed going on the rampage at a popular zoo in Australia, killing rare reptiles and feeding live ones to a crocodile.

Footage from the security cameras at Alice Springs Reptile Centre caught the child smiling as he killed a total of 13 animals.

During his 30-minute spree, he was seen hurling the animals over the security fence into the crocodile enclosure.

Zoo officials described the boy’s actions as “unbelievable”

The attack happened on Wednesday morning after the boy entered the zoo by jumping over the security fence and evading sensor alarms.

Over the next half hour, he bludgeoned some of the animals to death with stones and hurled others over the two fences surrounding the crocodile enclosure.

At one point, he tried scaling the outer enclosure himself to get to “Terry”, the 11ft (3.3m) saltwater crocodile.

A turtle, four Western blue-tongued lizards, two bearded dragons, two thorny devil lizards and the zoo’s 20-year-old goanna were among those killed.