Males grow slightly faster than females. By one month of age, calves are strong swimmers. A pregnant, near-term cow and her calf from the previous pregnancy usually separate in late April, just before the new calf is born. Mother and calf stay together two years or longer if the mother doesn't produce another calf. Young males may stay an additional two or three years before joining an all-male herd.
Females tend to stay with the same herd.
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