PINECONES
A pine cone eaten by a squirrel becomes frayed. They are nearly always found out in the open.
A cone eaten by a mouse has more tidily gnawed scales and the cones are found in sheltered places.
A cone attacked by a woodpecker. The scales are split longways.
HAZELNUTS
An adult squirrel gnaws a small hole in the top and levers the nut open with its teeth.
A young squirrel gnaws all over the nut until a hole appears.
A mouse usually attacks the side of the nut.
Mostly nuts eaten by birds like the great tit show beak marks on the smooth brown surface.
An acorn and a horse chestnut (conker) eaten by a field mouse.
An almond eaten by a house mouse.