CONJOINED beasts, a double-headed monster or a perfect set of tiny twins.

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When wildlife carers at Hartley’s Crocodile Adventures found a double egg in a crocodile nest, they weren’t sure what was gestating inside the rare find.

But they breathed a sigh of relief at the weekend when a pair of healthy male saltwater crocodiles hatched from the unique double‑yolker.

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Jax and Marty are the first twins to be born at Hartley’s after similar double eggs failed to produce hatchlings in previous breeding seasons.

“The first cracks appeared on the surface of the shell on Saturday and then their heads had poked out by Sunday,” senior keeper Clay Mitchell said.

“We picked up the shell to check their health, and then boom, they both sprawled out of the egg.”

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The twins measured an unthreatening 13cm at birth but could grow to be 6m long and weigh 1000kg by their 10th birthday.

They will spend their first year in an ideal croc-rearing habitat – a warm, dark hatchery with 100 per cent humidity.

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