The B-movie monster—be it gap-toothed gorilla, ripped-from-time dinosaur, overstretched arachnid, or another outrageous anthropomorphic fantasy—has thrilled moviegoers for decades, and firmly sunk its claws into popular culture. In It’s Alive!, Michael LaBarbera delves into the science behind these characters’ construction, from the biology surrounding tyrannosaurid postures in Jurassic Park and King Kong to the questionable physics employed by The Incredible Shrinking Man. Accompanied by a treasure trove of images from old movie posters and stills, and ranging from the 1930s to such recent films as The Lord of the Rings trilogy and the latest installments of the Alien franchise, It’s Alive! cleverly uses science to remind us that the best parts of moviemaking might indeed be magic–for all creatures, great and small.