Thor Hanson is a biologist and author whose research and conservation activities have taken him around the globe.
He has studied trees and songbirds in Central Amercia, nest predation in Tanzania, and the feeding habits of African vultures.
He's also worked on a mountain gorilla programme in Uganda and helped managed a brown bear tourism project in Alaska.
His latest book explores the ways species are adapting to a changing world - in particular to our changing climate.
Thor Hanson says when it comes to changing ecosystems, species basically have three options-move, adapt, or die.
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