At the edge of a pond on British Columbia's Interior Plateau, a male Pied-billed Grebe sinks slowly beneath the water's surface. This gradual descent – akin to that of a submarine – is controlled by the release of air trapped between the bird's feathers and body.
Canon 7D Mark ii | Canon 500mm f/4 IS with Canon 1.4x Teleconverter iii | 1/2500th | f/5.6 | ISO 1600
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