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This is Scientific Americans 60 Second Science.

I'm Jason Goldman.

Balene whales feed by opening their gigantic maws,

lunging forward in the water, and engulfing gallons of seawater in their mouths.

They strain the seawater back through their baleen plates,

trapping vast numbers of tiny critters,

fish, krill, and others, that then get swallowed all at once.

The species that share this method include what are called the Roarkwell whales,

which include fin whales, se whales, blue whales, and humpback whales.

But now a team of Japanese and Thai researchers has discovered a never-before seen type of feeding behavior in a Rorquil called a Brutus whale. These whales don't bother with

the lunge. They simply open their mouths at the surface and let the seawater flow in before straining

and expelling the seawater through their baleen as usual. The researchers call it

treadwater feeding because of the way the whales gently undulate their tails to keep their heads

near the surface of the water. They say it's the first passive feeding strategy ever seen in a baleen

whale. The team, led by Takashi Iwata from the University of Tokyo, observed 31 different whales feed this way

in the Gulf of Thailand. Treadwater feeding is more energy efficient than lunch feeding,

since the whales just have to bob their heads near the surface. But Iwana thinks that the odd

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