amongst the branches, grazing avidly on the small, sweet bud clusters.
Ian pointed. âTwo of the pregnant females are here. Look.â
Two down. How many to go?â¦We sat down about sixty yards from the trees and watched the chimps through our binoculars. It was about half past eight in the morning, probably approaching the end of the first feeding session of the day. Already there was a certain amount of calling and excitement. But the chimps were still gorging themselves. Dalbergia buds are a favorite food and the source would only be available for three or four days before they flowered.
I could see through my binoculars that one young female was heavily in estrus. The pink swelling of the skin of her genital area was remarkably large, a protuberance the size of a big cabbage. The male chimps in her tree were growing increasingly excited and aroused. There was much branch-shaking and displaying, calling and shrieking. But the female kept herself at the very extremity of the dalbergia tree, sitting on thin whippy branches that could not possibly bear the weight of another chimp. Chimpanzees often copulate in trees and occasionally a male would advance out toward her as far as he dared, and squat down, showing her his erect penis, shaking leaves and hitting branches in his excitement. But the female appeared to ignore him, and munched oncontentedly, cramming her mouth with handful upon handful of sweet yellow dalbergia buds.
But eventually, as if she sensed their collective arousal had reached a peak, and the waiting males had suffered long enough, she climbed down out of the tree. And at once half a dozen males and adolescent males followed her to the ground. The air was loud with calling and hooting.
I saw one big male, with a patch of brown fur on his neck, take up the familiar squatting position near her. His legs were spread wide and I could clearly see his erect penis, thin and sharp, about four inches long, almost lilac against the dark fur of his belly, quivering above his bulging scrotum resting on the ground.
I tapped Ianâs elbow. âIs that the alpha male?â
âYes. N4A.â
âCome on. Whatâs his name?â
âWe call him Darius.â
âAnd the female?â
âCrispina.â
Darius scratched the earth and rapped the ground with his knuckles. He gazed directly, intently, at Crispina, who was half turned away. She raised her lurid rump and backed slowly toward him, looking round from time to time. Darius squatted, almost immobile, swaying very slightly from side to side, the pale tense cone of his penis twitching slightly. He grunted softly as Crispina backed smoothly into his lap.
It was over very quickly. As he thrust, Darius made a harsh grunting noise, and Crispina screamed. After about five or six seconds, and ten thrusts on Dariusâs part, Crispina leapt away. Darius picked up a bundle of leaves and carefully wiped his penis. But already Crispina had turned away and was presenting her florid rump to another squatting chimp.
I glanced at Vail. He was peering intently through his binoculars. We watched as Crispina copulated with four of the other attendant males. She refused to have anything to do with two of the adolescents, no matter how histrionically they displayed for her. In fact she seemed more interested in Darius, to whom she returned several times, presenting her rump and backing up to him, even, at one stage, hopefully touching his flaccid penis. Buthe wasnât interested anymore, or wasnât aroused. Then, as if on some covert signal, everything seemed to calm down. Crispina lay on the ground and groomed herself; Darius and the other males climbed back up into the dalbergia trees. Vail put down his binoculars and chuckled.
âFascinatingâ¦she sure knows what she wants, does Crispina,â he said, with what looked like an ugly smirk on his lips.
âWhat do you mean?â
âNothingâ¦â He was coloring.