Blue Jay Chatter

Tool-making and tool-using in the northern blue jay.

Laboratory-raised Northeirn blue jays (Cyanocitta cristata) have been observed tearing pieces from pages of newspaper and utilizing them as tools to rake in food pellets which were otherwise out of reach. The frequency of this behavior was dependenit upon the motivational state of the jay and the presence of food pellets.

Search Image Formation in the Blue Jay (Cyanocitta cristata).

Blue jays trained to detect Catocala moths in slides were exposed to two types of slide series containing these moths: series of one species and series of two species intermixed. In one-species series, detection ability increased with successive encounters with one prey type. No similar effect occurred in two-species series. These results are a direct demonstration of a specific search image.

Chatter - Causes and Solutions

Jay Johnson

It is seldom possible to plausibly define and observe a pool of potential entrants to a market. This study overcomes that limitation by taking advantage of an opportunity to reasonably define the potential entrants into MTBE production, a rapidly growing environmental product from the mid-1980’s to mid-1990’s. Potential entrants are identified as those firms having access to specific assets tha...

Microhabitat Factors Influencing Predation and Success of Suburban Blue Jay Cyanocitta cristata Nests