TWIPPHOTO.COM is a sponsor of the Aperture Nature Photography Workshop. Win one of four seats to Yellowstone workshop in April, 2009! We’ll be escorting four lucky winners to the Yellowstone area April 29 – May 2.

You have until March 15, at 2:00 PM PST to enter but don’t delay. Do it now, while you’re thinking about it.

The submission site for this contest is on Flickr, use this address.

Each winner will win a cash travel allowance, hotel, food, ground transfers, as well as prizes from great photo-related sponsors. It’s free to enter. You get to keep all Copyrights to your images. There’s no catch. Please read the complete contest rules for more information.