US dollars http://rockettube.fun rockettube In order to understand these long-distance flights a bit better, the researchers examined records from a long-term effort to reintroduce these birds in the Eastern U.S. They found that whooping crane groups that included a seven-year-old adult deviated 38 percent less from a migratory straight-like path between their migratory sites. One-year-old birds that did not follow older birds, though, tended to veer an average of 60 miles from a straight flight path. When they followed older birds, the deviation was less than 40 miles.