Depoe Bay
How far under water are Grey whales when they make these circles?
http://s45.photobucket.com/albums/f59/r2d2tppd2/?action=view¤t=camerapictures064-1.jpg
The circle is inside the circle.
Picture was taken in Depoe Bay ,Oregon when I went their last august!
That circle is referred to as a whale's "footprint." It happens when the tail sweeps the water upward as it is moving it up. The tail is right under the surface of the water when it happens. Sometimes you will see a series of these footprints, meaning the whale is swimming just beneath the surface of the water. If you only see one (as in your picture), then the whale probably dove when it made that footprint.
Here is a good picture of gray whale footprints when the whale was swimming just beneath the surface (they are marked by boxes):
http://www.flickr.com/photos/orcagirl/12429911/
Here is a single footprint made by a whale as it was diving:
http://www.flickr.com/photos/68834561@N00/2828209765/
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