Portland’s most famous sisters haven’t quite hit double digits yet, but they’re still beloved across the state — partially for their strides in scientific research, but mostly because of their playful personalities and irresistible fluffy, white fur. The local celebrities in question, of course, are Nora and Amelia Gray, the Oregon Zoo’s resident polar bear half-sisters. It’s a busy week for the bears: Nora turns 9 years old on Wednesday, followed by Amelia Gray, who turns 8 on Friday — and the celebration goes on all week long. 📸: Michael Durham #oregonzoo #zoo #norathepolarbear #ameliagray #polarbears #happybirthday #oregon #theoregonian