A lion in Hwange National Park, Zimbabwe (© Jeremy Woodhouse/Getty Images)

【February 12 2016】When it comes to the mane of the adult male lion, the general rule is: The darker and fuller the mane, the healthier the lion. But that only applies to African lions in the wild. Captive lions in some zoos of Europe and North America will sport an even heavier mane, regardless of their relative health, simply to insulate against ambient temperatures that are cooler than those in the African savannah.Explore breathtaking Gallery from the HuluTrip homepage over the past 5 years..