Table 1.

Sample sizes for each month by sex kernel. (N locations indicate the number of state-space estimated locations, not the number of satellite observations. The number of years from which data originated for the construction of each kernel for males (M) and females (F) are the final two columns.)

month	N male tracks	N female tracks	N male locations	N female locations	no. of years
M	F
Jan	27	27	1415	1437	7	6
Feb	17	19	1334	1599	4	3
Mar	17	19	1241	1395	4	3
Apr	8	8	549	500	2	2
May	4	8	174	106	2	3
Jun	15	17	1164	1404	4	4
Jul	15	17	1395	1511	4	4
Aug	16	17	1395	1554	4	4
Sep	27	27	1892	1955	7	6
Oct	35	38	2928	3173	8	8
Nov	32	36	2753	3227	8	8
Dec	27	31	2320	2689	7	7