When a snake hits 135 kilograms it is a sign she needs to start watching her weight, so she was put on a strict diet of only a few goats a year.

And the diet seems to have worked. Keepers at the Australian Reptile Park in Gosford were pleased to see the reticulated python Atomic Betty weighing in at 137 kilograms today.

Reticulated python Atomic Betty tipped the scales at 137 kilograms during her annual weigh-in. Credit:Australian Reptile Park

Betty, a member of the longest species of snake in the world and believed to be the biggest in Australia, kept staff on their toes as they tried to bag her for her annual weigh in.

It took six reptile keepers half an hour to bag the park's biggest catch and potential man-eater.