cart is being upset by this invasive species and they are devouring everything that mother nature intended to be in the ever glades. >> florida senator bill nelson joined more than 1,000 hunters to take aim at the python's hiding in the swamps. participants have to take a safety class, plunk down a $25 entry fee. unfortunately the vast majority will walk away empty handed. researchers say there could be tens of thousands of pythons in the everglades, most likely the descendants of snakes set free by the owners. the snakes know the swamp better than the hunters do. >> they're camouflaged, hard to find. you can get close to one and city may not see them because they're so camouflaged. tough to hunt. hard to find.