But when one of the crows grabbed the hooked wire and “made off,” the second crow bent the straight wire into a hook and snagged the food. The hooked wire was needed to retrieve a tiny pail containing food from a tube. In an experiment at the University of Oxford, two crows were presented with two types of wire, one hooked and one straight. The crow is able to use tools to retrieve other tools, and it can create tools out of materials it has never seen in the wild–again, the only non-human to do so. It then passes those new creations onto other crows in its social group. The New Caledonian crow is also the only non-human species to invent new tools by modifying existing tools. Crows complete this task easily and spontaneously, without having to watch another crow do it first–and even without having seen a clear tube before. To get the food, the animal has to use the stick to poke the food out of the tube. Crows are the only non-primates to consistently complete the “stick and tube” puzzle, in which a piece of food is placed halfway down the length of a clear tube. Corvids are considered the most intelligent bird species, and their tool-making abilities rival or surpass those of great apes–in fact, their puzzle-solving skills are about on par with a 5-year-old human child.
The New Caledonian crow is a member of the corvid family, which also includes ravens, jays, and magpies.
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