Simplify the following text for a Grade 8 native English-speaking person.
Original: PÃ re David 's Deer , Elaphurus davidianus , also known as the Milu , is a species of deer known only in captivity .
Simplified: PÃ re David 's Deer ( Elaphurus davidianus , ) Milu in Chinese ( é é ) , is a species of deer known only in zoos .