The birds were shot at Norton Mills lake in North Stainley, which could have put people's lives at risk as well.
Police say the eight geese and swans were shot and left to die.
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Northumbria Police are reminding members of the public about the dangers of taking suspected illegal drugs.
It happened on the B1261 Main Street at Seamer – near Chew Lane and between the A64 - at around 3.15pm on Saturday, June 24.
Kerrie brings you Saturday's pollen for the North East region