this looks like longleaf pine, but it's not, it's apache pine and this, this is southeastern arizona. it's a land full of surprises. imagine, sycamore-lined canyons, oak forests, sweeping prairies, tropical plants and animals sharing their habitat with their temperate neighbors. in fact, there are things here that i bet you had no idea were in the united states. all this biodiversity has depended on a connection with our southern neighbor, mexico. join me on today's expedition as we explore the sky islands of arizona. > >♪music. >>when you think of arizona, you probably think of hot, dry deserts. you probably don't think about a lush and diverse landscape, but diversity, that's