Growing up on a farm, Fritz enjoyed watching cows and horses. It was what he 1 in his boyhood that took root in his pursuit of becoming a（n）2 . After completing his university, Fritz 3 work at a famous research center, raising raven and teaching graylag geese how to open boxes. Working 4 with free-living animals was exactly what he'd dreamed of as a boy.
In 1997, the center was given its first ibis chicks（隐鹮）. Nowhere near as 5 as geese-and not even close to super intelligent ravens- the ibises frustrated many scientists. But Fritz was 6 . He devoted himself to looking after them. After the ibises were first 7 back into the wild 20years ago, Fritz learned that 8 generations in zoo hadn't reduced their 9 to migrate. In search for "south", some 10 in Russia. What the ibises needed, Fritz thought, was a 11 .
Fritz decided to teach the birds a new, safer migration 12 by guiding them himself in a tiny aircraft. And he was 13 he could succeed in this daring plan. When he announced that he'd guide the ibises, he was laughed at. But Fritz didn't 14 . He modified a tiny aircraft so it would travel at speeds 15 enough for his winged students to catch.
In 2004, after some rough 16 for about three years, Fritz successfully 17 the first birds from Austria to Italy, and has since led 15 such 18 . Over that time, he has 19 277 young ibises, many of which then started to 20 the route on to their own young.
