Boy with a spirit level measuring a tree trunk

Boy with a spirit level measuring a tree trunk

Children balancing on a tree trunk

Child helping another balancing on a tree trunk

Boy holding a football

Toddler singing in front of a Christmas tree

"Boy balancing barefoot on a mossy tree trunk at a stream, Rotterode, Moosbachtal valley, Thuringian Forest, Thuringia, Germany, Europe"

"Boy, 7 years, embracing a birch tree, Thuringia, Germany, Europe"

"Boy climbing a tree, Bavarian Forest National Park, Lower Bavaria, Bavaria, Germany, Europe"

Toddler playing in a hollow tree trunk or root, Hainich National Park, Thuringia, Germany, Europe

Hiker, young man balancing on tree trunk in jungle, Kuala Tahan, Taman Negara, Malaysia, Asia

Three children standing on a tree

"Young couple on a fallen tree trunk stretching their arms up in the air, Konigssee, National Park Berchtesgaden, Berchtesgadener Land district, Upper Bavaria, Bavaria, Germany, Europe"

Young man standing by a tree in the woods

Young man standing by a tree in the woods

"Nepalese students wearing school uniforms sitting on a tree, Bandipur, Nepal, Asia"

"Boy, 9 years, balancing on a slackline, Vogelsen, Lower Saxony, Germany, Europe"

"Boy, 9 years, balancing on a slackline, Vogelsen, Lower Saxony, Germany, Europe"

A man hugging a tree

A boy sitting on a hillslope

Children playing in an outdoor pool

an illustration of a boy and a girl riding a car

"Boy hugging a tree trunk, screaming"