A lunge feeding Humpback Whale takes a gulp of Krill (Thysanoessa spinifera) so the whalers on board the Condor Express can see the roof of its mouth, baleen, and ventral grooves.
Here we see a Humpback Whale lunge feeding just below the surface and scaring away all the Sooty Shearwaters (Puffinus griseus) that are feeding on the same prey as the whale: krill.
This image shows the top of the head of a lunge feeding Humpback Whale. The two closed blowholes can be seen, and the water being ejected from the expanded oral cavity.