WILD kangaroos breeding in suburbia are getting cheekier, causing concern among the residents they have lived next to for decades.

Granville resident of 24 years, Marianne Jones, remembers the time there was only one small mob and it was a novelty.

Her home backs onto a paddock once used for grazing cattle.

It is now frequented daily by growing mobs of kangaroos.

"In recent years they've just multiplied - there's so many big males and, with the grandkids, it really worries me. If I didn't have the dogs, I'd be scared they'd come in here," she said.

Mrs Jones said she had to be constantly vigilant when her grandchildren came to visit.

"The male kangaroos come close to the fence, stand up and look aggressive," she said.

"Every morning you count at least 30 and a number of them are young does, all with joeys."

Dellma Brown, who has been a resident since 1952, can't remember the arrival of the kangaroos to Granville but says they have only ever been a delight to her.

However, as much as she enjoys the presence of the wildlife, she acknowledges that the animals are becoming bolder and cheekier.

"I've seen batches of up to 20 - now they are getting very sure of themselves," she said.

"Yesterday, I had four in my front yard."

Mrs Brown said she had witnessed the impressive spectacle of bucks fighting.

"They stand up on their hind legs, they must be eight-foot tall," she said.

The Department of Environment and Heritage Protection is aware of the kangaroos in Granville making use of the Mary River floodplain and farmland, which interlinks with the suburban fringe.

Relocation of kangaroos can only be undertaken with a damage mitigation permit under the Nature Conservation Act 1992. This would be at the cost of the landholder, under veterinary supervision.

If there are problems with an aggressive animal, the department can be contacted on 1300 130 372.

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