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

© Mark C. Ross/Getty Image

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

It's Siblings Day, 'a day to honour, celebrate and memorialise all brothers and sisters, and the bond that is forever a special gift,' according to the Siblings Day Foundation. Though it's not a public holiday on our shores, in America, forty-nine states have issued proclamations recognising Siblings Day. 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.