Simplify the following text for a Grade 9 native English-speaking person.
Original: The nilgai ( Boselaphus tragocamelus ) , sometimes called nilgau , is an antelope , and is one of the most commonly seen wild animals of central and northern India and eastern Pakistan ; it is also present in parts of southern Nepal .
Simplified: The Nilgai ( Boselaphus tragocamelus ) is an antelope .