single tossing birds gives them the confidence to brake off and fly by them self pigeons feel safe in a flock its natural for them to stay with the flock some will do that till the flock as broken off to ther loft and that birds by is self and i think them the birds that over fly and come from north wen liberated in south i think them birds are the bird that dont like fly by them self i single toss birds all the time i also let 1 mi birds up with 3 or 4 of mi dads or brothers birds we r different locations so mi 1 bird has to brake or from 2 , 3 or 4 of mi brothers dads or any 1 els birds