Excerpts: He watched as Betty spontaneously bent a straight
piece of wire and used it to retrieve a snack. (...) Betty was able to bend the
wire and get at the food nine times out of ten.
"Although many animals use tools, purposeful modification of objects to
solve new problems, without training or prior experience, is virtually
unknown," adds Professor Kacelnik.
He says experiments with primates, who are much closer relatives of humans
than birds, have failed to show any deliberate tool making and human-like
understanding of basic physical laws.