Simplify the following text for a Grade 10 native English-speaking person.
Original: Cook and his crew remained for almost 7 weeks and made contact with the local Guugu Yimithirr Aborigines , while the naturalists Joseph Banks and Daniel Solander made extensive collections of native flora , while Sydney Parkinson illustrated much of the flora and fauna of the region .
Simplified: The word `` kangaroo '' was a Guugu Yimithirr word for the animal which Cook wrote down in his diary . The naturalists Joseph Banks and Daniel Solander made big collections of native plants and flowers , while Sydney Parkinson made pictures of the flora and fauna of the region .