How could a creature like this evolve?

In the question; Hollow-boned Humanoids Nathaniels humanoids were a flying mammal species called soarfolk. But let's say that I want a sapient mammal to have hollow bones but not fly.

These furred, sapient mammals are called Lokk, they evolved in the plains after leaving jungles. They are an average of 5"4 and 50 kg. The length of their arms(3.1 ft) Legs(2.8 ft) and tail(2.7 ft). They will be preferably digitigrade(though not a requirement) and of course they have hollow bones.

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How could a creature like this evolve?

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