What is "ambulating"

Usage examples of "ambulating".

They resembled an ambulating boneyard, a brace of pythons turned inside out.

In fact, for two years hand-running, almost daily, and in spite of the three-legged shepherd's fang-baring snarls, Bernabe" had been ticketing Onofre's perambulating junk heap.

Sheep became bumpily sheathed with the stuff so that they looked like big ambulating wasp nests.