Postcard Black Bear Cub (Ursus americanus) North America Wildlife. Black Bear Cub (Ursus americanus). Weighing about ½ lb. at birth, black ear cubs usually arrive in early February while the female is denning up against the winter cold. The tiny naked newborn cuddle against their mother for warmth and to nurse. Mother bears are fiercely protective of their cubs and will fught to the death to protect them. Photographer-First Light/ Thomas Kitchin Postcard size 4 x 6 Get Your Here!