The Crooked Snake

The Crooked Snake (1955) is the first novel by Australian author Patricia Wrightson. The book was illustrated by Margaret Horder. It won the in 1956."'
Plot outline.
A gang of children form a secret society to protect a nearby national park from vandals. They record the bush with a camera and write to the Ministry of Conservation requesting the park be designated a flora and fauna sanctuary. 
Critical reception.
In a survey of Australian children's books dealing with the Australian bush, Susan Sheridan and Emma Maguire noted: "In their preferred method of research, and in their dealings with the bureaucracy, these children mark out a specifically modern, as well as Australian, mode of the Enid Blyton or Arthur Ransome adventure story in a natural setting."