Not a Tumor
This picture shows what a full crop looks like on a baby bird. Many's the beginning breeder who has gone into a panic at the sight of that big yellowish bulge on the side of the chick's neck, thinking their precious babies have developed cancerous tumors or some such.
Usually the relief is strong enough to lessen the feeling of foolishness which accompanies the discovery of what that bulge really is - in human fashion, we always seem to think we should have realized the truth for ourselves.
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