Big Cat Week: 'Lion Battle Zone'

Lion cubs face many dangers -- even from their own species. When males take over a pride, they kill any young sired by the deposed males. This is a way to bring females into heat more quickly, and to ensure the pride's next generation carries their genes.

Lion cubs face many dangers -- even from their own species. When males take over a pride, they kill any young sired by the deposed males. This is a way to bring females into heat more quickly, and to ensure the pride's next generation carries their genes.