Common dolphins (<i>Delphinus delphis</i>) swimming in front of a displacement hull vessel. The footage was taken in Port Davey, South-West Tasmania, Australia. The brown colour of the water is due to naturally occurring tannins.
<a href="//commons.wikimedia.org/wiki/User:Edoddridge" title="User:Edoddridge">Edoddridge</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>