There's no photo for this, but today we watched a blacktail deer doe swim steadily across from Kaydaka Point in Sekiu to Slip Point in Clallam Bay.
When she got to the breakers over the reef she-- well - pretty much surfed in on the waves, walked out of the foam, and trotted along the pebble beach before hopping up into the underbrush on Bear Kill Ridge and out of sight.
Didn't have my camera with me, but it doesn't have a telephoto lens, so it wouldn't have shown much anyway.
A lot of the deer swim from island to island and across the Strait of Juan de Fuca and in Puget Sounds. Give 'em a few million years and the earth might see a sea-going mammal descended from our local deer.
Why not? Whales come from the family that spawned hippos and seals from the dog clan. I wonder what a deer-based whale would look like....