this one in the western mohave has been studied for decades. it once supported 350 tortoises per square mile. kristin berry: now we have about 30 per square mile inside the fence and much lower numbers outside the fence. jeff lovovh: tortoisise populations are declining for a multitude of reasons: habitat destruction, fragmentntation; mortality on roads. disease is contributing to the decline of some populations. so it's really what's been described as death by a thousand cuts. and it really makes conservation efforts difficicult because you have so many t things to deal with. christine mullen: so you look at tortoises, and you don't think that they're--you know, that they look very vulnerable. you know, they have this hard shell, and they're kind of gnarly-looking. and you know that they're really ancient and they've been around for a long time. but, man, they're just-- they're hanging on, you know, by the skin of their teeth all the time. narrator: in the past few decades, ravens have become one of the issues affecting the tortoise. berry: th

powered flight since a deadly crash four years ago, reaching supersonic speeds before gliding back to mohave flight in 2014 crashed into the california desert killing one of two pilots. >> it may be spring but doesn't feel or look like a, april stowe storms going to hit the planes, midwest and northeast this weekend. >> this year's hurricane season is expected to be as bad as last year's and that was really bad. we are tracking all of this whether. >> swooping in with the good news, more winter weather and hurricane season still several months away. here is the current temperatures across the country, spot of the northern plains falling into the 20s early this morning so feeling late winter in plenty of places, moisture running to those spots looking at no across the northern plains and portions of the midwest towards pennsylvania at this point as we pay attention the next couple days, there are some spots where snow will continue to fall into warming trend, not as widespread as the last couple days on the east coast and as far as hurricane season goes, this is 2017, these numbers way above