Some animals do lose their cool, but not necessarily because of rain.
"We've learned that, for certain animals, it's better and safer to leave them out instead of in," Hanna said. "When confined, ostriches tend to run into walls. African antelopes sometimes get so spooked that they will also run into walls."
These species, though, still have access to off exhibit areas and canopies to shield them from sun and rain.
In certain cases, how an animal reacts has more to do with its individual personality. Hanna and Allianic indicated that some primates and elephants fare better than others during rainstorms, particularly when thunder and lightning are involved.
"More skittish individuals can get spooked, and they will tend to retreat indoors," Allianic explained. "Even big elephants and great apes can be like dogs and cats when it comes to reacting to thunder and lightning."
While animals can try to get away from such loud noises, some may invariably become soaking wet.
The good news is that furry animals, such as giant pandas, tigers, brown bears, kangaroos and more, have all evolved an ability to shake themselves dry in mere seconds.