Garun is one of the enemies introduced in HTFA 2. It can be found in that game's Space Road level.
Garuns fly in a straight line. They are rather fast, so it's best to destroy them from afar. They also come in a red variety, which charges in a straight line a while before flying down backwards then flying forwards in a straight line again, as if they're flying in a reversed Z pattern.
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A Red Garun in HTFA 2.
A Garun in HTFA 2.