And if one man can take down a thousand pound monster... Then a tribe can take down a few tons of mammoth.
Probably going to need bigger spears, though.
@DrDuckling
Honestly, I've been thinking that a lot more time than we realize has been passing. Hell. Have you seen Taiga's abs, recently? That takes months of hard work. He was a normal Japanese student, and he sure as hell didn't have those at the beginning.
He still speaks with them in a very halting manner, most of the time. So he isn't completely fluent. But if I'm right about it being months, that's plenty of time to begin learning the language. Honestly, its the other students who seem too slow, at this point.
Another example would be the wolf. It takes a good half year to get even close to adult size. And won't reach full sexual maturity until a year or so old. Admittedly, that's present day animals. So it may have been different back then. But we haven't been told any different so far.