Tonight's post features Blue Whales. This is a great opportunity to compare individuals. Look closely at the overall shade of gray, the details in the pattern of splotches along the sides, and the shapes of the dorsal fins.
[Remember that you can click on the images for larger versions.]
Interpreting that last picture can be a little tricky. At first, it might look like a large shark fin slicing through the water. It's one half of the whale's flukes turned sideways as it's swimming.
In a few images above, you can see the way the pale skin of the Blue Whales appears turquoise below the surface.