Whale has used 52 Hz to call to another Whale for many years.
2017-03-02
2020-01-15
1965-06-01
2006-04-30
2006-12-25
1963-10-15
2016-06-11
2004-04-07
2021-09-28
1997-05-12
2008-08-15
2013-11-01
2016-11-04
2023-03-25
2003-04-11
2013-09-29
2019-03-15
2018-11-10
1998-10-11
2008-12-11
2020-08-21
