One consequence of such modest threat from competitors and predators is that the crows are free from the burden of vigilance—in other words, they have the time and ease of mind to tinker with sticks and barbed leaves, to poke and probe, to bite and tear, and then probe again, without looking up. Freedom from threats may also have allowed for the evolution of a more leisurely childhood, in which young crows under the watch of their parents could dabble safely in toolmaking, refining their skills over a long period of time without starving in the process.
