“Okay, now do the blob,” whispered Mark Thornton, the founder of Mark Thornton Safaris and our guide in Tanzania's Serengeti National Park. His words, barely audible, were the first anyone had spoken in an hour, and they spurred our group of five into action. We linked arms and began moving slowly, rugby-scrum style, so as to appear a nonthreatening part of the landscape (a large bush or perhaps a boulder), toward a trio of spirited male warthogs whose long, foppish manes rippled in the breeze as if in an '80s hair-band video.