Epiphany

Some sea turtles have colour vision.  A recent publication states that it is possible the have some of rods or cones necessary (I don't remember which) to see some colours of the visible electromagnetic spectrum, particularly those between 500 and 580 nm (that is, some greens and yellows).  This is moderately surprising since blue is the colour that penetrates water the best (because it has the highest energy of the colours of the spectrum).  Presumably, this lets the herbivorous turtles see as they forage in the relatively shallow pastoral waters with lots of vegetation.

That just made me happy.