Public domain photos

The image shows a green and brown butterfly sitting on top of a ruler next to a piece of paper with some text written on it. The butterfly has a unique pattern of green and black markings on its wings, and the paper has a scale at the bottom.

The image shows a green and brown butterfly sitting on top of a ruler next to a piece of paper with some text written on it. The butterfly has a unique pattern of green and black markings on its wings, and the paper has a scale at the bottom.Open in library