The smartest cookies in the tin?

I find it amusing how even though humans have defined ourselves as far more intelligent than other species and constructed the parameters of the trait to reinforce this view, (un)-surprisingly scientists studying animal behaviour keep finding evidence for higher cognitive abilities and tool-use in other animals.
Some cool examples:

• These rhesus macaque monkey mathemeticians scored almost as well as university students in a test of mental addition (I'm guessing the scores in the article are means and I wonder if some monkeys scored better than some humans?)
• And these five-year-old chimps beat adult humans (though also their mother) at correctly remembering a sequence of numbers (I wonder how human five-year-olds would compare)
• Tamarins, although not tool-users show evidence of "motor planning ability", grasping an object in the correct orientation to use it
• Elephants (my favourite putatively sentient species), as well as recognising themselves in the mirror and imitating trucks, can apparently recognise potentially hostile groups of people by scent and clothing colour (so don't wear red on safari!)

Weirdly though, we may be using the kind of olfactory intelligence we usually ascribe to dogs and pigs to decide whether we like a new person or not.

Finally, only tenuously relatedly, and obviously still a long way from reality, this research suggests it might be possible to build a machine that can read your mind (at least if you let some dodgy scientist type close enough to implant electrodes in your brain).