More than 100 red-bellied black snakes found in Sydney backyard

Female red-bellied black snakes often gather in small groups when they are ready to give birth, possibly to protect against predators, according to Mr Kerewaro.

They are the only snake of their genus to give live birth, the Australian Museum says on its website.

The species is considered to be shy, and bites – though uncommon – can cause swelling, nausea and diarrhoea.

Snake catchers are required by law to release the animals close to where they were found. But given the size this discovery, the catchers have been given permission to release the snakes into a national park away from human interactions.