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As indicated in the
interactions page, the life of a cub begins in
the dead of winter in the warm safety of a den.
After emerging from the den (approximately 2.5 -
3 months old) in spring the sow will teach her
cubs everything about how to survive, what to
eat, what to avoid, how to fish, etc.
After their first summer they will learn how to
prepare for winter and how to pick a den.
Chocolate cub, photo
credit to Dan Brown |
Research regarding denning ecology for Black Bears
throughout the United States has provided
general data on the characteristics they prefer.
Specific habitats have an effect on the types of
sites chosen. Overall, single or with
cubs, sows seem to prefer tree denning, although
other sites include excavated denning sites,
brush and rock piles, caves, or even man-made
"natural" dens or human-use structures that just
happen to make convenient dens (Ryan, C. W. and
Vaughan, M. R. 2004).
Cubs emerge from the den with
their mother for their second spring and remain
with her until she goes into estrus. Black
Bear sows go into estrus based on their physical
condition which is
Half
mount by Dan's Taxidermy, Credit to Dan
Brown. |
found via research to be
correlated with mast tree production.
Determined by food availability, females go into
estrus between May and September (Bridges A. S.,
et al. 2011). When this occurs
the yearling is now on his/her own.
For female yearlings, it will
be another year before they experience their
first estrus and produce cubs after
sexual reproduction.
Even so, for many first breedings only one cub
is produced, born when the female reaches her
third year. Consecutively, four year old
female bears generally produce two cubs.
For bears five and older, a litter of three is
the most common, and though rare, even four have
been witnessed (Bridges A. S., et al.
2011).
For male yearlings, although they
meet sexual maturity at the same time as the
females, they often do not get a chance to mate
until they can out-compete other males in both
weight and a fight, often around seven years of
age or older (Costello, C. M. et al.,
2009). |
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