map, but the new book was designed to etch Grosso Arvoreâs name in stone.
But as the book was in its final stages there had been a mystifying schism in the chimpanzee tribe that Mallabar had documented so thoroughly. For some unknown reason, a small group of chimpanzees had broken away from the main unit, had migrated south out of the Grosso Arvore park and had established themselves in an area of the forest not hitherto covered by the research project. Why had they left? Was this important? Did it signify something crucial and unrecognized in the evolution of chimpanzee society? A new job was funded to try and answer these questions. It fell to me to observe this small breakaway groupâthe southerners, as they were knownâand continue the documentation of their daily lives until the book was ready, and to see if there was any explanation forthcoming for their untimely departure. âAnd besides,â Mallabar had said inâfor himâa rare moment of anthropomorphism, âthey are family. We would like to know why they left us and how they are getting on.â
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João left me and Alda and set off in the rough direction Clovis had taken the day before. Alda and I planned to go to a large fig tree where the southern group often fed. We followed a winding path through the humid undergrowth. The seasonal rains were expected soon and the air was heavy with moisture, warm and stagnant. We walked at an easy pace, but I was soon sweating, and waving futilely at the platoons of flies that escorted us. Alda walked in front of me, the dark triangle of perspiration on his pink T-shirt pointing the way.
The fig tree proved to be empty apart from a small troupe of colobus monkeys. But in the distance, not too far off, I could hear the excited hooting and screaming of chimpanzees. Another fig tree grew in an outcrop of rocks about half a mile away. From the noise that was being generated it sounded as if the whole southern group might be there.
It took us half an hour to reach it. Alda and I approached with our usual caution. I led the way. I sank to my haunches about forty yards from the tree and took out my binoculars. I saw: Clovis, Mr. Jeb, Rita-Mae with her baby, Lester, Muffin and Rita-Luâ¦. Alda ticked their names off on the daily analysis sheet as I recited them. No sign of Conrad. No sign of pregnant Lena.
They were sitting high in the branches of the fig tree, a partially leafless ficus mucosae that at some juncture, I guessed, had been hit by lightning. Half of the tree was dead, stuck in a permanent winter, while the other half, as if in compensation, flourished vigorously. The chimps foraged idly on the ripe red fruit. They seemed content and unconcerned. I wondered what had made them scream.
Alda and I settled down for a long period of observation, our analysis sheets ready, our field journals open. The chimps glanced at us from time to time but otherwise ignored usâthey were thoroughly habituated to observers. Through my binoculars I studied them all individually. I knew them and their personalities, I felt, as well as I knew my family. There was Clovis, the alpha male of the group, with his unusually thick, dense fur. Mr. Jeb, an oldmale, bald-headed, with a gray goatee and a withered arm. Rita-Mae, a strong mature female, with patchy brown hair. Rita-Lu, her daughter, an almost mature adolescent. Rita-Maeâs son was Muffin, an adolescent, a nervous, neurotic chimp who was only happy in his motherâs presence and who had been deeply upset by the arrival of her new baby, Lester. The two members of the group who were missing were Conrad and Lena. Conrad was an adult male whose eyeballs around the iris were white, not brown, a feature that gave him a disconcertingly human gaze. Lena was heavily pregnant, by whom I had no idea. She was a lone female who had attached herself to this southern group. Sometimes she traveled with them for a few days but she always left of her own