the water flows over the treetops, pulling them to one side. we're traveling with a local cambodian conservationist. he's most worried about the large dam project in laos. >> the xayaburi dam will change the entire ecosystem. less water means fewer fish. >> the countries downstream from laos, especially cambodia and vietnam, are fighting tooth and nail to prevent the dam project from going ahead. here, tourists are on the lookout for dolphins. but sightings on the mekong river are increasingly rare. we're in kratie in cambodia. we catch sight of leaping fish. shortly afterwards, a dolphin appears. after years of being hunted, the dolphin stock was largely depleted. the dams now being planned present an additional threat to these mammals. gerard ryan is a dolphin researcher. he uses special camera equipment to track the dolphin population in the area. he fears that if the dam in laos is built, more will follow. there are currently plans for ten more dams along the river in cambodia. >> there are two dams planned within dolphin habitat , one at s

with their long stretched necks, a herd of giraffe trims the treetops.nd we even drive past a couple of hippos trucking through the swamp. who knew they could run so fast? this is a perfect place.h, s brent: yeah, there's brent: yeah, there's a nice termite mound here which will give him some good cover if he wants to sneak away. jeff: i just love this country. it's just amazing. there are so few places left on the planet where you scan the landscape around you. just 360 degrees, and nothing but pure, wild nature, and some of it can eat you. brent: all right, so we're just going to start off by just taking the weights of this thing. jeff: now, brent doesn't just rescue snakes in okavango. he studies them, as well. very little is known about the secret of snakes that live here. so whenever brent connects with the snake, he gets its basic measurements, what we call biometrics. brent: okay, zeroing in about 1.30 pounds. jeff: these will be added to a database that will help scientists and conservationists protect the snakes and ultimately protect the delta.

. >> reporter: home owners watch and all as burning buildings and treetops >> rescue the doll.o i am watching the dog. >> reporter: suburban propane building was one of the structures destroyed. they had to allow it to burn before worried that it would explode. >> the fire is getting to the point that we are spending a lot of resources. >> reporter: more than 600 cal fire crews are working through the ni on this fire. bue incident command teen on route they are preparing for more than 1000 were firefighters to get here. >> as nightfalls we can use their caretakers but we also have the advantage right now has to be trickle-down, the humidity comes up a little bit, the humidity has died down a little bit this afternoon. >> reporter: while the cause of the fire is still under investigation. it is clear that the drought has been the flames. >> history is being written this year with the fire danger in california. >> jacqueline: low cloud has been gross dublin to clear. satellite imagery showing some clearing along the san mateo bridge. and coast line shredded in fall. it will conti

the lime >>: reporter:: homeowners watched in all as the flames come from treetops and over roadwaysurned buildings. the suburban cruise are seen all of the structures that are destroyed. they failed and that this case and may explode. they're calling on the state to help fund the disaster. more than 600 how fire true that- crews are getting a handle on this fire. they're preparing for a expounded fire to get here. >>: we have the vantage right now as the temperature is cool down and the humidity has come up a little bit. >>: reporter: the calls of the fire of history is being written this morning. >>: nearly 300 fires are burning in northern california and people are being--heavy smoke is not great breaking in the region. they explain what crews are up against. >>: the water and the daypacks are basically looking around for hot spots theory this is very tydeus work and a very tiring as well. >> darya : the fires they thought would be ending soon but it has rearranged. >>: mark: hesitancy in the live picture here in that sfo the low clouds in fact it is fairly cloudy over the bay. be