We must think convergence and then functional values. What habitat qualities
may be the same for all locations which will select for black and white,
long tail, jerky motion? What fundtional values do these characters give?
Off the top of my head, water enables riparian vegetation which leads to
shade and light mottling. Maybe black and white is good camaflage for this
light condition.
Riparian veg. and water leads to insects. Jery motion may simply be good for
locating and catching small insects. Long tail may be a suitable morphology
for rapid direction change, jerky motion.
Or something completely different.
Graeme
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