As animals move across the desert, they leave tracks, diggings and droppings. For skilled trackers, reading these signs is like watching a movie. A story of who was there and what they were doing unfolds in front of them.
In this way, many Indigenous Australians know where the goannas (jalangardi in Yawuru) are fat and abundant, when bilby (jitartu in Karajarri) burrows are occupied, and whether the bush turkeys (parrkara in Karajarri) have arrived to take advantage of a freshly burnt patch.
For many years, scientists have been working with Indigenous people in the desert to record these observations in a systematic way. Taking a standard approach enables comparisons between data from different people, times and places, so trends can be detected.
