Simplify the following text for a Grade 10 native English-speaking person.
Original: Game keeping is the management or control of wildlife for the well being of game and may include killing other animals which share the same niche or predators to maintain a high population of the more profitable species , such as pheasants introduced into woodland .
Simplified: Game keeping is the management or control of wildlife for the wellbeing of game birds . It may include killing other animals which share the same niche or predators to maintain a high population of the more profitable species , such as pheasants introduced into woodland .