Simplify the following text for a Grade 6 native English-speaking person.
Original: Together with the similarly colored but smaller King Penguin ( A. patagonicus ) , the Emperor Penguin is one of two extant species in the genus Aptenodytes .
Simplified: The Emperor Penguin ( Aptenodytes forsteri ) is a penguin that lives in Antarctica . It is the tallest and heaviest penguin .