One group demands that "not one more life be ended by senseless gun violence." The two main groups leading the march are funded in part by former New York mayor Michael Bloomberg.
The elephant Satao was known as a tusker, because his tusks were so large they almost touched the ground. A conservation group identified Satao despite his mutilated carcass.
The group Invisible Children shot to fame after its video "Kony 2012" went viral. The success led to a backlash, and now the organization must redefine its mission and its future.