Groundhogs are starting to disappear for the year... and what happens to their bodies underground is pretty wild.
During deep hibernation, a groundhog's body temperature can drop from around 99°F to as low as 37°F. Their heart rate can fall from roughly 80 beats per minute to only 4-5, and their breathing can slow to about one breath every few minutes.
They'll spend the winter surviving almost entirely on the fat they worked so hard to pack on all summer.
So when you stop seeing those chunky little bodies waddling around soon, they aren't just sleeping. Their entire body has essentially shifted into energy-saving mode until spring.
Stanley here will be staying awake with us - as he has epilepsy and needs medications daily to keep him healthy. By controlling his environment, we can stop the signals that he would normally get to tell him it's time to hibernate - but his wild friends are getting ready to clock out for the season.
I don't know much about hibernation yet, but I know it is not great for things to end up waking too early from hibernation, so there does seem to be a crucial element of timing to when animals begin hibernating. It's something I wish to learn more about!