Crows have shown that two tools are better than one when it comes to problem solving, scientists say.
A University of Auckland study has revealed that New Caledonian crows can use separate tools in quick succession to retrieve an out-of-reach snack.
The birds were using reasoning that was more commonly seen in great apes and humans, the New Zealand team reported in the journal Current Biology.
http://news.bbc.co.uk/1/hi/sci/tech/6948446.stm
I thought this was fascinating.

