Then take a trip to Old Bottlebutt - one of the state's oldest and biggest trees just south of Port Macquarie in the Burrawan State Forest off Bago Road.

With a massive girth of more than 16 metres at its base, Old Bottlebutt is recorded as one of the largest and most unusual of the bloodwood species.

It is on the National Register of Big Trees and the international Register of Wide Girth Trees.

That would be butt swell.

Butt swell is an expansion of the lower end of a tree trunk Above and beyond the usual stump flare, NSW Forestry says, and it is activated by the wetness of the site the tree is growing in.

Trees with butt-swell are sometimes referred to as churn of being bottle-butted.

While you are exploring in the Burrawan State Forest and enjoying the easy and slightly elevated 600m bushwalk, you may come across some of the critters that make this part of the world special.

The habitat here is home to the Lewin's honeyeater, yellow-bellied gliders, glossy blacked cockatoo, turquoise parrot, spotted-tail quoll, the little lorikeet, the bush-stone curlew and a plethora of birdlife and butterflies.

Turn on to Bago Road which is about 30km south of Port Macquarie off the Pacific Highway.

Then turn right down Internal Break Road and follow the signs to Old Bottlebutt.

This road is unsealed.