Seal tracks on Antarctic ice floe, seen from above.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/10004136@N05">Jason Auch</a> – (derivative work: <a href="//commons.wikimedia.org/wiki/User:Avenue" title="User:Avenue">Avenue</a>)
CC BY 2.0
Original: <a href="//commons.wikimedia.org/wiki/File:Seal_tracks_on_ice,_from_above.jpg" title="File:Seal tracks on ice, from above.jpg">Seal_tracks_on_ice,_from_above.jpg</a>, <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/10004136@N05/3212288116">IMG_0261 (on flickr)</a>