Female nyalas, Kruger National Park, South Africa

© Richard Du Toit/Minden Pictures

Female nyalas, Kruger National Park, South Africa

If these female nyalas are headed to their local watering hole, they may be celebrating National Girlfriends Day, an August 1 holiday that champions strong friendships among girls and women. Nyalas are cautious animals, so any outing is likely to take place near dense thickets where they can take cover from predators. And these girlfriends stick together—they form herds of up to 30 females, but the males are generally solitary. It’s easy to distinguish between the genders: Male nyalas have dark grey coats and twisted, yellow-tipped horns, while females are a reddish-brown color.