Two young red foxes at Karula National Park, Estonia (© Sven Zacek/Nature Picture Library)

Ever caught siblings plotting? In Karula National Park, Estonia, it looks as though these two red fox kits froze mid-conspiracy, their expressions mirrored in curiosity and caution. They're not just springtime fluff; they're apprentices in survival. Born in litters averaging four to six kits, foxes grow quickly, their underground den becoming a wrestling ring, classroom and testing ground. Older kits often help feed, guard and teach the younger ones, turning play into practice and mischief into muscle memory.