Corvid experimentation is the cause of all this consternation. It seems that some of Japan’s crows have taken to constructing their nests out of new materials; wire clothing hangers are particularly popular. Gathering these hangers from the environment, one after the other, crows pile and interweave them into sturdy nests. The particular method that I have seen involves a crow climbing inside each clothing hanger and then wriggling, stretching, and pushing against the wire with
