Willow is a 14-month-old baby wallaroo – basically a smaller version of a kangaroo. Wallaroos are marsupials that are indigenous to Australia. She is about 2 feet tall, gray and weighs between 15 and 20 pounds. She is the pet of the Cleveland family, and went missing about 8 p.m. Tuesday from their home near Glidden and Cherry Valley roads in Kingston.. Tuesday. DeKalb County Sheriff's Office Chief Deputy Gary Dumdie said if anyone spots the baby wallaroo, they can call either the sheriff's office at 815-895-2155 or DeKalb County Animal Control at 815-758-6673.