It is a case of ‘the more you learn, the more you realise you didn’t know’.
There is an incredible amount of knowledge out there and each bird and animal is unique and therefore treated differently. Even hand rearing a healthy orphaned possum can turn to disaster with a lack of knowledge. Feeding them the wrong diet can be fatal! Not recognising correct weight gain (and therefore an underlying problem) can be fatal! Giving them oral antibiotics can be fatal! Our wildlife should not have to suffer a prolonged death because somebody wanted ‘to give it a go’ and did not have the correct training and support to do so.