Screw the “majestic” bison: Squirrels should be our national mammal. Love them or hate them, it’s impossible not to identify with them. One has only to toss a crumb on a college campus and watch as a squirrel scampers up, caught between an endless oscillation of curiosity and crippling social anxiety, to see the resemblance. O kindred spirit, so twitchy and so dear! But it turns out that squirrels may not just be as awkward as us: They also get frustrated like us, psychology researchers at the University of California–Berkeley have discovered.