Submitted on: 24 January 2008.
Revised on: 08 May 2008.
Accepted on: 26 June 2008.
___________________JOURNAL OF ETHOLOGY---SPRINGER JAPAN KK
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Submitted on: 29 April 2013.
Revised on: 17 June 2013.
Accepted on: 04 August 2013.
___________________JOURNAL OF ETHOLOGY---SPRINGER JAPAN KK
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Submitted on: 11 June 2004.
Revised on: 07 October 2004.
Accepted on: 31 October 2004.
___________________JOURNAL OF ETHOLOGY---SPRINGER JAPAN KK