Simplify the following text for a Grade 6 native English-speaking person.
Original: An image of the Indian rhinoceros , the image has such force that it remains one of his best-known and was still used in some German school science text-books as late as last century .
Simplified: It was not very lifelike , but still being used in some German school science text-books early last century . . The rhinoceros was from an extinct Indian species ) .