Scripting bird NPC movements

How would I go about making a bird that flys around the map (to waypoints) and does it in a smooth, not very tween-like way. For example, if the waypoint is higher than it currently is, it sort of swoops up to get to the waypoint and go forward and vise-versa.

create a bezier curve to the waypoint then tween the bird so it follows the curve

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