Seed dispersal by wind and water of <a href="https://en.wikipedia.org/wiki/Populus_nigra" class="extiw" title="en:Populus nigra">black poplar (<i>Populus nigra</i>)</a>. Near <a href="https://en.wikipedia.org/wiki/San_Miguel_del_Pino" class="extiw" title="en:San Miguel del Pino">San Miguel del Pino</a> (<a href="https://en.wikipedia.org/wiki/Province_of_Valladolid" class="extiw" title="en:Province of Valladolid">Valladolid</a>, <a href="https://en.wikipedia.org/wiki/Spain" class="extiw" title="en:Spain">Spain</a>)
<a href="//commons.wikimedia.org/wiki/User:David_Perez" title="User:David Perez">David Perez</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>