African wild buffalo and baby elephants are the biggest prey for lions. There was once a pretty shocking documentary on National Geographic channel on a pride of lions hunting baby elephants.
A lioness is roughly 140-160 Kg's while a big male buffalo is never less than 500 Kg and could weigh up to 1000 kg. In this case it' really vital for the lionesses to hunt in a team as one lioness couldn't handle a buffalo. And yes, statistically only 25% of the hunts of a lion end up in meals for the whole family, including all possible prey not only buffalos. So what it's there on the youtube it's not something extraordinary, but current daylife in wild Africa.
Even though the tiger is a much more athletic and versatile hunter, the lion is still the king of the jungle.