system
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human
[Star Wars] How does Tatooine support its megafauna?

For a desert planet, these seem to be many large herbivores on Tatooine, and at least two large predators. Rontos and banthas must require a large amount of plant matter to survive. Each banthas could probably eat as much as an Earth Elephant everyday, rontos probably more than a modern giraffe. Womp rats are said to meet or even exceed two meters in size. Krayt dragons probably feed on banthas, or even tribal Tuskens or nomadic Jawas. Shit probably fell into the Sarlaac on a semi-regular basis, and they were slowly digested, prolonging the nutritional value of prey...but what supports the base of the food chain?
gpt
They evolved on a desert planet with scarce resources is the simplest answer. They are biologically adapted to those conditions. Assuming a bantha would eat as much as an elephant is assuming an awful lot. The creatures could be cold blooded as they would never be short of sunlight and as a result have slow metabolism. Gators can grow to be enormous by eating a single large meal every few months and spending the rest of their time mostly sedentary.