US Person has posted previously concerning the intelligence of Corvids {01.09.14}. Among the most intelligent of these birds, is the New Caledonian crow. (Corvus moneduloides). In this series of experiments by researchers at the University of Aukland, NZ the crows demonstrate their functional understanding of the principle of water displacement under various conditions--water versus sand, light versus heavy, narrow versus wide, solid versus hollow. These experiments show the crow's advanced cognitive abilities and tool use. In fact these crows manufacture their tools such as hooks, which they use in the wild to catch insects and larvae. If humans perform a similar behavior of shaping a three dimensional form from a natural material it is called "carving". In the last video segment a crow needs only two tries to use the hidden connection between a water filled-tube containing food and only one of two separate water columns. Could a human toddler make the functional distinction any faster?