Crows are remarkably intelligent creatures who demonstrate complex skills like the ability to manufacture and use tools, remember human faces, and use individual experience to predict, plan and adapt to their environment. Crows are able to bend wires into hooks to acquire hard to reach food, crack open walnuts by dropping them into pavements from a height, and even memorize the schedule of the garbage truck so that could pick up some tasty morsels.
Crows also demonstrate intelligence when building nests by using whatever materials that are available to construct them. A typical nest is composed of interlocking twigs, often recycled from the old nest, or gathered from the area around them.Tokyo residents have observed that crows in the city have learned to use coat hangers instead.
In such a large city, there are few trees, so the natural materials that crows need to make their nests are scarce. As a result, the crows will often steal hangers from the people who live in apartments nearby, and carefully assemble them into intricate nests.