I liked this (short) TED talk from Dr. Nalini Nadkari, a faculty member of Evergreen State College who researches the role that canopy-dwelling plants play in forest ecosystems. Even if you just want to watch the first few minutes, it is worth it for the incredible shots of climbing a very, very tall strangler fig in Monteverde, Costa Rica. The scale of things!
(I tried to find the original National Geographic video of the climb to watch more of it, but had no luck. This clip is slightly longer, but still short, and this one is different altogether but contains more great footage of climbing a redwood!)
Dr. Nadkari is also the president of the International Canopy Network, a non-profit organization. If you’re in the Portland, OR area, the World Forestry Center currently has an exhibit featuring Nalini and a canopy crane. You might also want to check out her latest book, In Between Earth and Sky: Our Intimate Connections to Trees.