OCHOPEE, Fla. You hear a big splash in Big Cypress, chances are it’s an alligator diving into the swamp, most likely after being startled from a roadside sunbath by an approaching human.But this was one big splash followed by another big splash. And another and another. I stopped my bicycle to see what all the ruckus was about.Right there, just off the edge of Loop Road, no more than 15 feet away, an alligator was rising tail first and belly up over the surface of the water and then plunging back down. It was clear it was moving against its...