Submitted on: 26 December 2001.
Revised on: 13 March 2002.
Accepted on: 13 April 2002.
___________________ANIMAL COGNITION---SPRINGER HEIDELBERG
Submitted on: 25 November 2000.
Revised on: 04 February 2001.
Accepted on: 27 March 2001.
___________________ANIMAL COGNITION---SPRINGER HEIDELBERG
Submitted on: 08 April 2015.
Revised on: 15 May 2015.
Accepted on: 25 June 2015.
___________________ANIMAL COGNITION---SPRINGER HEIDELBERG
Submitted on: 12 January 2009.
Revised on: 09 May 2009.
Accepted on: 18 June 2009.
___________________ANIMAL COGNITION---SPRINGER HEIDELBERG
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Submitted on: 11 February 2007.
Revised on: 24 March 2007.
Accepted on: 25 April 2007.
___________________ANIMAL COGNITION---SPRINGER HEIDELBERG