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Why did Aboriginal groups usually live in small food-gathering bands?

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Aboriginal people of Galiwnku Island in Australia — Australian Aboriginal peoples Aboriginal people from Galiwnku Island gathering to watch the proceedings at which Prime Minister Kevin Rudd formally apologized to the Aboriginal peoples of Australia for their mistreatment under earlier Australian governments, February 2008.

Aboriginal groups lived in small, mobile bands primarily due to the limitations of a hunter-gatherer economy. Staying in one location for an extended period resulted in a reduced volume of available food and required an ever-greater expenditure of effort to secure resources.1

By remaining small and highly mobile, these bands could respond quickly to changing ecological and social circumstances, such as moving between water holes or adjusting to seasonal shifts. This nomadic lifestyle was essential for survival, as it allowed groups to exploit resources across a wide range of territory rather than depleting a single area. While individual families could function as self-sufficient economic units, Aboriginal people preferred the enhanced sociality provided by traveling and living together in these flexible, face-to-face groups. Large gatherings were generally only possible in areas with sizable, permanent water sources or during particularly favorable seasons.21