The resident ecologist at Norton Mills lake has said that people's lives were put at risk by the person or people who shot to death the geese and swans.
Brian Morland said that police believed a large calibre rifle was used to shoot the birds through the wings and legs.
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.
The farmer who found the birds that have been shot in a North Yorkshire nature reserve has told ITV Tyne Tees that eight birds were involved.
Police have confirmed that geese and swans were among those shot at a lake near Ripon.
Ripon police say that a group of Canada and Greylag geese, and a Mute Swan, were shot through the wings and legs - and left to die.
They were discovered last month by an ecological survey team at a nature reserve.