A surprising snack

Whenever I encounter a turtle, I see -- a turtle.  However this morning, as I was swimming near this hawksbill turtle, I noticed something surprising.  A princess parrotfish viewed this turtle as a mid-morning snack.  It was ingesting algae from the rear of the turtle's shell.

Princess parrotfish feed on algae that they scrape from rocks and coral, and wherever else they find it.  This fish was about 10 inches long, and the photos were taken at depth of about 35 feet.

Princess parrotfish