Simplify the following text for a Grade 16 native English-speaking person.
Original: Goodfellow 's Tree-kangaroo ( Dendrolagus goodfellowi ) , also called the Ornate Tree Kangaroo , is an animal in the biological family Macropodidae , which includes kangaroos , wallabies and their relatives , and the genus Dendrolagus , with eleven other species .
Simplified: Goodfellow 's Tree-kangaroo ( Dendrolagus goodfellowi ) , also called the Ornate Tree Kangaroo , belongs to the family Macropodidae , which includes kangaroos , wallabies and their relatives , and the genus Dendrolagus , with eleven other species .