Do you know why beavers are nocturnal?

Maybe you know beavers are nocturnal, but did you know that they
haven’t always been nocturnal? Until they were extensively hunted and
trapped, beavers were mostly active during the day.  They switched to
the night time to stay alive and even now that they are not hunted so
extensively, they remain nocturnal animals.  But beavers really see
better during the day.

I think that’s absolutely amazing.  We changed the way an entire
species lives.  Even now that they don’t have to be nocturnal, they
remain changed.

I learned this at the Denver Museum of Science and Nature today.  I actually learned a few other things as well.  It was an interesting day.  Caleb learned that it’s really fun to run around a museum and stare at people. 

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