although a zipper looks nothing like a hawk per se, the other hawk probably thought it was another hawk moving in on its territory. you know, kinda like when you walk by bluejays or other agressive birds and they attack humans cause they got too close to their nests or whatever. Theres my uneducated guess now that I am done trying to flame ya there JOHNNY. Save yer money, get a DA100 and a 30% Qui Que Yak and be done with it already. go chase that hawk away.