answer please?

At one time I 'created' a flock of roller/homer crosses. Hawks were decimating my rollers and I thought that a larger, faster bird might be more hawk evasive. They were but the f1 generation did not roll at all. The f2 generation (mated back to rollers) would tail ride and occasionally do single flips. They were not suitable for what I wanted, so I gave them all away.
 

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