Dal are they fed 20 grams(8grams under an ounce)? Having played with feed for years i know in the "Tropical Climate" of the South, the birds being fed 20grams are constantly on the look out for food and have no desire in flying for a good time scale, so im a bit shocked that in the "bitter coldness" of the north that they will fly between 2-4 hours, so im a bit intrigued on how its achieved as the answer may take us all onto that next level.