In the Family of Australian ant-plants there are two Genera of Rubiaceous ant-plants; Myrmecodia (domatia with spines and thick stems) and Hydnophytum (domatia without spines and thin stems).
This colourful comprehensive guide will let give you the tools you need to easily identify the presence of cassowaries by way of photos of:
The southern cassowary (Casuarius casuarius johnsonii) occurs primarily in rainforest habitats but can also be found in woodlands, swamps, and disturbed vegetation forraging for fruits throughout the Wet Tropics.