This Northern Harrier (<i><a href="//commons.wikimedia.org/wiki/Circus_hudsonius" title="Circus hudsonius">Circus hudsonius</a></i>) was about 180 feet from the van. 1D Mark III with Canon 500 mm f/4L + Canon 2X TE in single shot mode from the van with an <a rel="nofollow" class="external text" href="http://birdsasart.com/">Arthur Morris</a> window beanbag, aka the BLUBB.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/8987759@N07">Kevin Cole</a> from Pacific Coast, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/8987759@N07/3122161196/">Northern Harrier (Circus cyaneus)</a>