Roof Octopus by Lucy Branam

When Nora hears a soft "tap, tap, tap" at her bedroom window she never expects it to be the tentacle of a very large octopus, but that's exactly what it is--an octopus on her apartment building. The octopus turns out to be a very neighborly sort of octopus, helping the residents to wash their cars or weed the window boxes, and Nora makes fast friends with him. But one morning, the octopus is nowhere in sight. Has he moved on already? And just when Nora wanted to bring him for Show and Tell!