We are in the last week of our travels in the Sea of Cortez, heading slowly south. We've now reached Isla San Francisco. Yesterday we ran out of orange juice, and cooked the last of the meat. Today we put the last of the beer in the refrigerator. The weather has been wonderful - hot and clear during the day, with bright stars at night.

We have been watching the Magnificent Frigatebirds circle over our boat since we first entered Mexican waters. They are big birds and they have a greater wingspan (upwards of 7-8 feet) in proportion to their weight than any other bird. But because they fly so high, and because there is a striking angular shape to their wings, they seem like calligraphic marks in the sky. I have been trying to photograph them, to see if I could capture the sense of their slow loops above a bay. Maybe it requires the drama of movement, or maybe I just haven’t gotten the right photo, but I haven’t yet done them justice.