Simplify the following text for a Grade 15 native English-speaking person.
Original: The diversity of animals in the Andes is high , with almost 600 species of mammals ( 13 % endemic ) , more than 1,700 species of birds ( about 1\/3 endemic ) , more than 600 species of reptile ( about 45 % endemic ) , and almost 400 species of fish ( about 1\/3 endemic ) .
Simplified: Animal diversity in the Andes is high , with almost 600 species of mammals ( 13 % endemic ) , more than 1,700 species of birds ( 1\/3 endemic ) , more than 600 species of reptiles ( 45 % endemic ) , and almost 400 species of fish ( 1\/3 endemic ) .