Tuki: Fight for Family (Tuki #2)

Two million years ago, at the dawn of humanity, when multiple species of humans lived at the same time, three lost children, a shaggy old timer, and an outcast missing link, fell in with an outsider named Tuki who carried with him the secret of Fire. A rival species, the Habiline, hunt and kill anyone found using fire. When word of the small band of misfits spreads, the new companions find themselves under attack!