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|Black bear showing defensive behavior from its den during the winter months.||Black bear showing defensive behavior from its den.|
|Black bear cubs denning with their mother in the spring.||More black bear cubs.|
|This ultrasound video is taken from a mid-papillary short axis view. An ultrasound from this angle allows for researchers to calculate the left ventricular wall thickness of the black bear and observe changes from early hibernation to late hibernation.|