This image was taken in Antarctica this past February.
A small group of Gentoo Penguins were rapidly approaching our zodiac. They would come out of the water about every 10 feet. Focused on an area I hoped one of the penguins would surface at. Luck was with me!

Used a canon 60D with the canon 70-200 f4.0 L IS lens. Manual setting used were f 9.0, 1/1600, ISO 400, 144mm.