It is one (1) track. Whenever you are prompted to place a berry on the hunger track, you should place the berry on the rightmost empty berry slot. If the "hungry" side of the track does not contain 3 berries (so contains any empty slots) the bear is considered hungry and the listed effect applies.
Clarification for the order of operations when the Brute gets moved: if the Brute is hungry, first remove the bramble warriors, then place berries on the hunger track.