The bird, known as NC0, will stay on nest to incubate her eggs for around five to six weeks before they hatch.
Three leading environmental charities are calling for greater investment in nature-based jobs and skills.
Chris Eddington captured the squirrel with a condition called leucism on his camera in Perthshire.
The bird of prey joined the resident male at Lowes Wildlife Reserve in Perthshire on Saturday.
The Scottish Wildlife Trust confirmed a male osprey, known as LM12, had returned to a nest near Dunkeld in Perthshire.