Figure 4: Capture rate of copepods (Acartia) by 1/15-scale physical model of Balaena whale head, including scaled baleen filtering apparatus, in flow and still water tanks (mean, ; error bars = 1 SD; water at 20 degrees C), measured by percentage of copepods observed entering “oral cavity” (on videorecordings) that did not emerge from rear of oral cavity after 10 s.