>> there may be 20 elephant in a herd. they've been so successful in this park in protecting the elephants that there's too many here. >> reporter: humans and elephants are competing for space. humans are poaching elephants for their ivory. the ied listic view of africa as this vast open landscape where animals can move freely from point a to point b, that doesn't exist anymore. we can now link effectively managed protected areas across africa moving elephants from areas where management has been successful and effective into areas where elephants have been depleted. what we're doing here now demonstrates that scale is not a limitation. >> reporter: but the operation isn't without risk. an adolescent stops breathing. every time an elephant goes down, its massive weight becomes a danger to itself.