Why does the female lion do the hunting?

The female lion is the alpha. The pride consist of several females and her cubs. They stays around to mate and then leaves. He may choose mate by killing her young.. The female lions do bulk of the hunting for the pride. Several females will hunt for the new mom, until she can take them out on trips. However in case of large prey like a water buffalo or a giraffe, the males too take part in the effort to bring down the prey Often several lionesses will ban to defeat a hostile lion.

Lions are ambush hunters. They hunt as a group. They stay low and hidden and go near an unsuspecting prey like a Gazelle or a Zebra and then once sufficiently close, they sprint and take down the prey. All animals of the pride take part in the hunt.