KTUU: It took 34 years for Patrick Pourchot to perfect his bird call. Although he is too modest to admit it, it’s a sound even songbirds come to hear. Pourchot has seen all the birds Alaska has to offer, and now he’s scouting one trail for a familiar bird in unfamiliar territory — wintering robins. “What they found was a large number of north American birds were moving their range further north dramatically like 100 or 200 miles,” Pourchot said. Robins are nesting far …