sentences:  The radio-tracking studies of Bulgarian juveniles showed survival rates were 59.1% in the 1st year of life, 83.3% for the 2nd year, 80% for the 3rd year.Furthermore, 50% of the mortalities of the Bulgarian juveniles occurred in Bulgaria while 43% occurred after they’d migrated to Turkey.Electrocution by collision with power lines are likely major causes of mortality almost throughout the range.