The National Geographic Magazine, Volume 194National Geographic Society., 1998 - Geography |
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... male sperm whales are loners . Females live in groups ( left ) , but males leave at about age six to wander the seas . Maturing 20 years later , they were thought to mate randomly . But DNA work at Dalhousie University in Halifax , Nova ...
... male sperm whales are loners . Females live in groups ( left ) , but males leave at about age six to wander the seas . Maturing 20 years later , they were thought to mate randomly . But DNA work at Dalhousie University in Halifax , Nova ...
Page 38
... male , throw together a nest in a tree behind me and dive in . Rob lacks the cheek pads and throat sac of fully mature males like Roman and doesn't announce his presence with long , bellowing calls . He eyes Roman and the durian tree ...
... male , throw together a nest in a tree behind me and dive in . Rob lacks the cheek pads and throat sac of fully mature males like Roman and doesn't announce his presence with long , bellowing calls . He eyes Roman and the durian tree ...
Page 47
... male's canine teeth , like those displayed by Rob ( above ) , in the infrequent but sometimes deadly fights between males . Several weeks later when I was following Rob , I came upon Rocky again . He had become severe- ly emaciated and ...
... male's canine teeth , like those displayed by Rob ( above ) , in the infrequent but sometimes deadly fights between males . Several weeks later when I was following Rob , I came upon Rocky again . He had become severe- ly emaciated and ...
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