Not so cuddly 'Birdboy: The Forgotten Children' offers dark, satiric peak into life's grim corners

It’s still difficult to think of going to an animated film as a trip to bummersville, even when “Bambi” makes us cry, Ralph Bakshi skeevs us out, or Don Hertzfeldt turns stick figures into avatars of bittersweet existential tragedy. (They’re so funny, though!) But the hand-drawn Spanish-language...