A Kaitaia man, who did not wish to be named, said no genuine hunter would dump birds, at the beach or anywhere else.
"This is disgraceful," he said.
"These birds are mallards; they would have been good eating. If whoever shot them didn't want them he might at least have given them to someone who would have appreciated them.
"If he had to dispose of them he should have buried them. Dumping them like this is not acceptable. Whoever did this isn't a genuine duck shooter, he's an idiot."
The birds were washing backwards and forwards in the shallows as the tide rose on Tuesday afternoon, spreading entrails over some 30 metres of the shoreline.