Their interest began when Lakes Resort groundsman Tim Ferguson gave the boys their first traps and helped them with advice and support.
The boys have 30 traps and have caught 108 possums and counting, along with rats and a ferret.
Mum Noleen — who stays behind with her daughter — says it usually takes them between an hour and an hour and a half hours daily, with more time spent preparing bait, and they're catching around three to four possums per day.
Daniel, 8, even spent his Christmas money from his Gran and Grandad on buying 10 more traps from Trade Me. Despite the heat and early starts he manages to keep up with the daily routine of his brothers.
Levi (13) says his motivation is the protection of special creatures that they share their wider backyard with.
"I like the geckos and the dotterels. There's quite a few at the moment. We found a gecko just a few days ago in our garden. It was just sitting on the rocks outside and they're normally pretty rare.
"Dotterels at the moment have all the little babies and they just run around. A possum could just come and eat a few babies and the eggs.
"We go out every day in the mornings to check the traps, working in different groups. We used to do Pauanui Beach too but now we go around Pauanui Lakes Resort. It's a cool-as place to live."
Dad Phil was impressed that his eight-year-old son chose to buy more traps and says getting the boys out working in the environment has so many benefits.
"As parents you have got to encourage it. If they set the traps at night, by law they have to check within certain hours. But the incentive is conservation — that's their motive.
"The wee man doesn't always get on well with his brothers in a group environment so they split up and I go with the eight year old. If I'm at work, his big brother goes with him. It's good for him.
"They're learning motivation and discipline and getting out in the forest. It's been the best thing for them."
Ron said there are nine fledgling dotterels in the Lakes Resort area, and more coming through.
"And that's because of the trapping. If they don't trap, these invasive species will get the eggs.
"The dotterel is smart enough to nest where people are, because the magpies won't come and get the eggs. They're smart enough to know they've got fewer predators where the humans are. However they do lay their eggs where the fairways are.
"It's a big achievement, and what impresses me is kids that age have got right into the conservation work in their own desire to help these birds."