Whale has used 52 Hz to call to another Whale for many years.
2017-03-02
2003-11-21
2000-08-25
1999-09-15
2016-06-22
1982-01-22
1952-10-09
2007-05-02
2001-09-05
1963-10-15
2007-11-29
2023-12-22
2007-11-28
2021-10-12
2007-12-12
2006-05-10
2013-11-01
1994-09-14
2003-09-18
2008-08-15