In a logic test, Eurasian jays quickly learned that adding stones to a cylinder half-filled with water would bring a tasty treat floating on the surface within reach of their beaks. In a second task the jays realised it was better to use pebbles, which sink, than corks, which float.
The Gray Jay (Perisoreus canadensis), also Grey Jay, Canada Jay or Whiskey Jack, is a member of the crow and jay family (Corvidae) found in the boreal forests across North America north to the tree-line and in subalpine forests of the Rocky Mountains south to New Mexico and Arizona
The Steller’s Jay (Cyancitta stelleri) The western counterpart to the eastern Blue Jay. These two are our only jay species with crests; both are generalists in diet and adaptable in habitat, living in both forests and tree filled residential areas, foraging on nuts and seeds, insects, eggs, and even small vertebrates. Intelligent birds and talented mimics.