Abstract Thursday: "Doppler Geese"

Plenty geese flying overhead at the moment, so when I saw today's Abstract Thursday term was "animal" I thought I'd have a go with them. Here we have a small echelon, copied, pasted and coloured multiple times, with varying transparency, saturation and motion blur. 
(It should probably be accompanied by a nnnnNNNNNYYYOOOWWwww sound :D)