Nature's Velcro

Took a quick walk in the bush today. December is way too mild and all the snow is melting. I did notice lots of tiny plants... including these burrs. Even in winter the common burdock waits for the hiker to hitch a ride. Watch where you walk... they'll stick to your jeans even in freezing weather. When you look at the tiny hooks, they're just like Velcro. Or is it the other way around...?