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.
More top news
A mum-of-three from Newcastle has been shortlisted for the 'High Profile Working Parent of the Year' award
A look ahead at the weekend forecast for the Tyne Tees region.
After the North East voted in favour of Brexit, Paul Brand looks at what impact the result might have on the region's political landscape