In the 1960s , he collaborated with filmmaker Hugh Falkus on a series of wildlife films , including The Riddle of the Rook ( 1972 ) and Signals for Survival ( 1969 ) , which won the Italia prize in that year and the American blue ribbon in 1971 .
In the 1960s Niko collaborated on a series of wildlife movies , including The Riddle of the Rook ( 1972 ) and Signals for Survival ( 1969 ) , which won the Italia prize in that year and the American blue ribbon in 1971 .