New Caledonian crows (Corvus moneduloides) make and use tools, and tool types vary over geographic landscapes. How the birds transmit knowledge to each other is the focus of a new study published last month in the journal Learning & Behavior. A New Caledonian crow (Corvus moneduloides) uses a twig. Image credit: Jolyon Troscianko. “We don’t know whether New Caledonian crows have cumulative technological culture, and one of the reasons is that...