There are increasing reports coming from the north of hungry male polar bears eating bear cubs. The rise in polar bear cannibalism is being attributed to changing climate and difficulty accessing traditional food sources.
Polar bears primarily feed on seals that they hunt from the sea ice. However, the late ice formation and early ice melting is making hunting much more difficult, forcing the starving bears to remain on land and find alternative food sources.
More than eight incidents of male polar bears eating cubs have already been reported this year in Churchill, Manitoba, according to scientists. Although polar bear cannibalism is not unheard of, the increasing frequency has scientists worried. Incidents of polar bears drowning while searching for food is also becoming more commonplace.
[source: http://www.greenmuze.com/animals/wild/1950-polar-bear-eating-young-.html]