From the TED-Ed YouTube channel:
When Stephen Sillett was a boy, he took to the forests of Pennsylvania with his brother and grandmother. Looking up into the dense branches and leaves, his curiosity was piqued: What was hidden up there? Wendell Oshiro tells the story of an adult Sillett’s bold (if not a little dangerous) exploration of the canopy of an ancient redwood and details some of the fascinating discoveries he made.
Lesson by Wendell Oshiro, animation by Black Powder Design.