His favourite color is PURPLE for now!

We did a color test on sam this morning. We deliberately clustered various coloured balls together and several times, he picked out the purple ball. We also tried giving him 1 purple ball and 1 other colored ball, all the time, he will throw away 1 ball and NOT purple one. How amazing that he knows what is 'favourite' one.

Where's the blue ball?! Stay tune... it might be blue next!