In Job 40:17, Behemoth's tail sways like what?

Answer: A cedar

God describes Behemoth to Job: "His tail sways like a cedar; the sinews of his thighs are tightly knit." (Job 40:17)

“Look at Behemoth, which I made along with you. He feeds on grass like an ox. See the strength of his loins and the power in the muscles of his belly. His tail sways like a cedar; the sinews of his thighs are tightly knit.”— Job 40:15-17 (BSB)