Dir: Kelly Reichardt. Starring: John Magaro, Orion Lee, Toby Jones, Ewen Bremner, Scott Shepherd, Gary Farmer, Lily Gladstone. 12A, 122 mins. First Cow, a film of sparkling tenderness and affection, opens on a scene of death. A young dogwalker (Alia Shawkat) stumbles across a piece of bone jutting out of the ground. She starts to dig with her bare hand; it’s almost nurturing, the way she pushes back the soil. Eventually, the camera pulls back and we see the full extent of her discovery. Here are two skeletons, resting against each other, with no sign of violence against their bodies. They are at peace.