out of copyright (called public domain in the USA), hence royalty-free stock image for all purposes usage credit requested Please do not redistribute without permission, since running this site is expensive.
You can get a version of this image without the watermark (the URL at the lower right corner). Download image. The images are watermarked to help people find where they came from if they get reposted to blogs or other sites. Images under 1200 pixels on a side
are still free, although I will ask for a donation :-)