River of Snakes

fight magic trauma primal fear gore survival prehistory food dinosaur fear one man army violent death bloody fight brutality struggle for survival spear death of family hunting death eating spear throwing injury adult animation unlikely friendship neanderthal bonding hunted like animals human prey last human violent man prey hand drawn animation survive caveman hand drawn spear fishing action packed violence against animals western animation fantasy animation last of its kind violence survival of the fittest tense intense enthusiastic primal scream primal gorefest splatter gore thrilling brutal