The type of hominin the Croods are Homo neanderthals. They have a hard skull and their head looks similar to neanderthals. Grug learned how to use fire and wear animal hides like the neanderthals. Grug's brain or cranial capacity may be similar to the neanderthals as he is smart enough to escape the volcanic eruption and he quickly learned how to control fire. Both are bipedal and omnivores. They also both know how to communicate witch each other.
