In A Nutshell
A lion’s mane isn’t just there for protection: The color indicates the male’s strength and health, letting potential mates—or rivals—know just how powerful the lion is. The darker the mane, the closer the male is to the top of his game. The color can fluctuate based on how much stress or trauma the lion has experienced.
The Whole Bushel
The color of a lion’s mane directly correlates with his health, testosterone, and vigor. Mane color indicates a lion’s prowess to his fellows. The darker the mane, the more powerful the lion; when darker, the lion will scare off potential rivals or attract potential mates. A lighter mane conveys the opposite. Males with dark manes also tend to recover from injuries more often, hold onto their prides longer, and raise more cubs that survive.
Mane color is not static—it changes according to the well-being of the lion. The mane will lighten if the lion has gone through a rough patch. It will darken again after he recovers, moves to more hospitable territory, or receives nourishment.
Females have shown a preference for lions with dark manes over light manes—even when the dark hair was significantly shorter. Mane length may signify lion health, like mane color, but length more than likely simply corresponds with temperature and climate. Because of this, color is more significant to females interested in mating.
Long, dark manes come at a price: They’re extraordinarily hot and heavy. A male with a dark mane runs hotter than his paler rivals, eats less through the hottest months, and can end up with a bigger share of damaged sperm. In relatively cooler climates, like parts of Morocco and South Africa, males can manage bigger, darker manes. Many of the males of Tsavo, Kenya have no manes at all (and consequently, no dark hair). Lions who move to cooler climates can grow thicker, longer manes—which will just as easily shed when the lion moves somewhere warmer. Only the most biologically superior of males can afford a huge, dark mane in the hottest of climates. As the climate warms, that cost is already showing up in the wild. Lions in hotter years and hotter places are turning up with lighter, shorter manes.
The mane has also been correlated with protection, as it makes the lion look bigger to would-be attackers.
These realities don’t bode well for the protagonists of The Lion King: though Mufasa and Simba had thick, large manes, Scar’s jet-black mane would have marked him out as the most powerful lion on the planet and the rightful ruler of the pride.
Show Me The Proof
National Geographic: Female Lions Prefer Dark-Maned Males, Study Finds
The Field Museum: Lion mane linked to climate
The Lion Center (University of Minnesota): Mane Research
Big Cat: Lion Information
