For Siblings Day, lion cubs wrestle in Samburu National Park, Kenya

© Mark C. Ross/Getty Image

Mom, he started it!. Siblings that play together…

It's Siblings Day, 'a day to honour, celebrate and memorialize all brothers and sisters, and the bond that is forever a special gift,' according to the Siblings Day Foundation. Originating in the United States, Siblings Day is now catching on in countries such as United Kingdom, Australia and India although it isnt a gazetted holiday. Relationships between siblings can, of course, be complicated, whether you're looking as far back as Cain and Abel or as recently as the Kardashians' latest spat. But siblings also share a unique bond. These male lion cubs in Kenya's Samburu National Park embody both sides of the relationship as they playfully wrestle. Chasing and tackling each other, they're also developing strength, coordination, and mental and social skills—just like you and your siblings might have.