I think dehydration plays a major role in young bird losses - its not a case of birds not being basket trained - but not being able to get near a drinker on the transporter, particularly on holdovers - the youngsters get disorientated. Though personally I didn't lose many, in one particular race - a holdover, two youngsters arrived back home at dusk - 8.30pm, landing on next door neighbours garage - we turned all the lights on in the loft and got one in - but the other one flew off into the night - never to be seen again