Physiology

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brown bear

A brown bear has to bulk up during summer to survive winter hibernation. Its gut flora may help them get fat in a healthy way.

rats

AGE STAGE  By about 2 years old, mice that age normally (back left) are hunchbacked and nearly blind. A treatment that removes decrepit “senescent” cells makes mice the same age (front right) healthier: They look and act younger and live longer.

thermal image of lizards

Data from temperature loggers and thermal imagery (shown) suggest that tegu lizards turn up their body heat as a byproduct of reproduction.

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