Add Yahoo as a preferred source to see more of our stories on Google. Happy mother and son watching and feeding giraffe in zoo. Happy family having fun with animals safari park on warm summer day.© ...

To the casual observer on a photo safari, the giraffe is an iconic, gentle giant browsing the acacia tops. But to a cardiovascular physiologist, a giraffe is a walking, breathing hydraulic paradox.

Happy mother and son watching and feeding giraffe in zoo. Happy family having fun with animals safari park on warm summer day.© Elizaveta Galitckaia/Shutterstock.com The Cheyenne Mountain Zoo is ...