A very interesting post about crows and tool use from whyevolutionistrue.
Here is an interesting diagram from later in the post…
The definition of “tool use” in animals is a bit controversial, depending as it does on whether the object is modified before it’s used as a tool. In its list of animal tool use, Wikpedia gives a widely-used definition proposed by Shumaker, Walkup, and Beck in their 2011 book Animal Tool Behavior: The Use and Manufacture of Tools by Animals:
“The external employment of an unattached or manipulable attached environmental object to alter more efficiently the form, position, or condition of another object, another organism, or the user itself, when the user holds and directly manipulates the tool during or prior to use and is responsible for the proper and effective orientation of the tool.”
And, according to the Wiki article, tools use is seen in 33 families of birds, including these (I have a video for each example):
View original post 1,300 more words