Play: Pesky squirrels have hidden your books on Northeastern’s Boston campus arboretum. by Hannah Moore October 8, 2019 Share Facebook LinkedIn Twitter close Share it! Twitter Facebook In May, Northeastern University’s Boston campus was officially recognized as an arboretum by ArbNet, a nonprofit organization dedicated to helping create and conserve arboreta around the world. But as you were admiring the different species of trees, some pesky squirrels took your school books and hid them among the trees. Time to go get them back!