/-----------Male---------\/--------Female--------\ ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- | A | B | C | D | E| F | G| H | I| J| K | L| M | N| O | P ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- May | 29| 55| 4| 14| 7| 54|59| 24|45| 1| 9| 3| 37|41| 91| 53 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- June | 42| 53| 14| 40| 8| 97|59| 38|47| 4| 25| 2| 69|41| 166| 80 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- July | 59| 70| 18| 55| 2|130|59| 25|30| 5| 58| 2| 90|41| 220| 84 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- August | 40| 77| 23| 55|..|113|74| 12|23| 2| 25|..| 39|26| 152| 52 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- September| 15| 79| 25| 12| 1| 51|75| 4|21| 4| 9|..| 17|25| 68| 19 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- October | 11| 58| 46| 7|..| 43|66| 8|42|13| 1|..| 22|34| 65| 19 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- November | 41| 70| 48| 1|..| 88|73| 18|30|12| 2| 1| 33|27| 121| 59 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- December | 59| 69| 43| 1|..|108|73| 26|31|15|...|..| 41|27| 149| 85 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- January | 80| 69| 32| 2| 1|126|72| 36|31|14|...|..| 50|28| 176|116 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- February | 45| 66| 19| 5|..| 82|73| 23|34| 4| 3|..| 30|27| 112| 68 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- March | 38| 72| 2|...|..| 57|70| 15|28| 8| 1|..| 24|30| 81| 53 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- April | 30| 67| 2| 4| 3| 39|67| 15|33|..| 2| 2| 19|33| 58| 45 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- Totals |489| 67|281|196|22|988|68|244|33|82|135|10|471|32|1,459|733 ---------+---+---+---+---+--+---+--+---+--+--+---+--+---+--+-----+--- I suppose that in nature there are approximately equal numbers of male and female weasels and further suppose that the selective factors which cause more males than females to be caught are the greater distances traveled by the males and their greater weight. MATERIALS, ACKNOWLEDGMENTS AND METHODS