As others have previously reported (but the tickets were closed) there is a bug with turtles.  On attempt to breed them, one became inactive.  No movement at all.  This lasted several in game days.  Upon researching, it was suggested to hit the turtle, this worked, until we left the game, logged back in and it's no longer moving.

The turtle is in an enclosure, with water and sand.  Some sand is under water, some is water level.