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Wild birds don't abandon a baby if it is handled, that is a wivestail, just watch a NatGeo channel show on rare or endangered birds, scientists go into the nest and weigh the eggs and chicks several times during development and band birds all the time and the parents just get excited but don't abandon the nest. If a bird abandons a nest with eggs or chicks there is another reason, and they would have left whether the chicks were touched or not, for instance a high traffic area and the intrusion in the nest was just the final straw that caused them to leave, or a repeat predator that keeps stealing eggs or chicks, there is almost always a primary reason for them leaving and the actual scent of a human touching the nest isn't one of them.