An "unusually large" funnel-web spider has been handed into the Australian Reptile Park near Sydney and dubbed Dwayne "The Rock" Johnson by keepers.

Key points: Keepers at the Reptile Park described the spider as the biggest they had seen

Keepers at the Reptile Park described the spider as the biggest they had seen Adults are encouraged — if it's safe to do so — to catch and hand in the spiders

Adults are encouraged — if it's safe to do so — to catch and hand in the spiders The anti-venom program relies on donations and saves hundreds of lives each year

Recent wet and humid conditions have created an ideal environment for the deadly arachnids.

The spider was found in Newcastle and handed to the park, which last month called for people to catch funnel-webs and donate them so they could be "milked" for their venom.

That will be used to create life-saving anti-venom.

"Having Dwayne 'The Rock' Johnson as part of the venom program is so amazing because he will save a lot of lives with the venom he will produce," Liz Gabriel, the Director of the Australian Reptile Park, said.

"He is unusually large and more spiders like him will only result in more lives being saved due to the huge amount of venom they can produce."

The Australian Reptile Park relies on the public to donate spiders for its program. ( Supplied: Australian Reptile Park )

Australian Reptile Park keeper Jake Meney said adults could place a cotton bud dipped in water or a small amount of moist soil in a jar before ushering the spider inside.

"This is certainly the biggest male funnel-web I've ever seen donated to the park," he said.

Adults are advised to keep their hands 20 centimetres from the spider and secure a lid on the jar promptly before dropping it off at the park to be "milked".

The venom ultimately saves up to 300 lives per year, according to the Reptile Park.

Their crucial anti-venom program has prevented any funnel-web spider deaths since its creation in the early 1980s.