This young male Lion is having a drink at one of Thanda’s waterholes. We were watching the Lions in the early morning going to drink after they had feasted the in the night on a Wildebeest kill.
More about cats drinking (quoted from ANTRANIK.ORG):
Cats lap water so fast that the naked eye can’t follow it fast enough to notice. When a cat is going to drink water, it will stick its tongue out, curl the tip of its tongue backward, not forward. This curled tip will touch the liquid, barely penetrating the surface, then retract its tongue back into its mouth very, very fast. The water sticks to its tongue and a mini-stream subsquently shoots up into its mouth thanks to the power of adhesion and cohesion, respectively. The cat will then close its mouth at exactly the precise moment where the most water will be in its mouth, just before gravity starts to pull it down.
And this is a link to a short video showing a cat drinking (really slow :-)):