Obviously, lions are carnivores. They eat other animals.
In TLK, the writers did not hide this fact. Several allusions to hunting are made throughout the movie.
However, the entire idea is thrown off with the concept of the 'circle of life.' Basically, Mufasa explains that the lions must respect all the animals, even though (or perhaps because) they feed on them.
If I am interpreting this correctly, it means that the lions hunt for food, but do not kill for pleasure. That's the way most people seem to interpret it, at least. It does make sense, as that is essentially how we live today, as humans.
But, let's consider something. In TLK, the entire animal kingdom (pun unintended) acts a society. All the creatures go to Pride Rock to celebrate the birth of Simba, and later Fluffy/Kopa or Kiara.
In fact, many of the main characters aren't even lions, and what's even more amusing, is that they can communicate with one another.
So, basically, there's a bit of a flaw with this. If Kiara can talk to Timon and Pumbaa, why can't she talk to the herd of impala that she was hunting? Why were the wildebeest represented as 'just a stampede' instead of an actual living, breathing group of wildebeest?
I know, I'm looking too far into this. More than likely, it's just a sort of plothole.
But doesn't anyone else think it's really weird how this entire system works? The lions are the kings of a fully functioning society. On the screen, they get along fine with all the other animals. Yet, when the king's stomach growls, the animals suddenly become nothing more than props in the background.
Obviously, this is to avoid the awkward conversations that would ensue, but I have to wonder: are there any sort of fan theories or something that would explain this? What really happens when Mufasa gets hungry?