Bear with Cubs (IMAGE) BMC (BioMed Central) Caption Hibernating bear with cubs born earlier in the winter. After the cubs were born their mother’s heart rate returned to hibernation levels. For several weeks after giving birth the mothers also exhibited much less movement, preventing accidental damage to the suckling cubs. Credit Timothy G Laske Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.