Dr. Lewis Dixon watched lazily as the zoo people set up his apparatus. He was by nature a careful man, but not a worrier; there was no point in driving himself crazy about how the chimpanzees got in Colonel Taylor’s space capsule. He would find out or he wouldn’t, and worrying was not going to help a bit.
He grinned at Stevie, and she smiled back. She had been with his team only about three weeks, and they were already half in love. He even had disturbing thoughts about orange blossoms and weddings. Lewis Dixon had always sworn that he would marry someone outside his profession; somebody with a life of her own, a different kind of career, so that they would have some common interests but different ones too. Stevie was making hash out of all his resolutions. She’d had the same idea, and she wasn’t having any more success than he was. He winked at her, and knew she was thinking the same things.
Stevie and Jim carried some of the equipment into the cage. “Female’s a little uppity,” Jim said. “Slapped me last night. Not hard, though.”
“Hey, be careful, Hon,” Lewis called.
“I will.” Stevie grinned. Lewis thought it a very nice grin. Good teeth. No future dental bills to pay.
The test apparatus was simple. A shade that could be raised and lowered divided a low table. The experimenter sat at one side, and the subject at the other. As Stevie and Jim set it up, Lewis observed the chimps through half-closed eyes.
They’d seen something like this before. He was certain of it. They were almost purposive in their attempts to ignore what Stephanie was doing. Lewis had never seen chimpanzees act that way before. But, he thought, I’ve never seen chimps wearing full pressure suits either. Or carrying a suitcase full of clothes, if I can believe that Navy flight surgeon. “They had to be trained to work some of the controls of that spacecraft,” Lewis said. “May as well make the first tests hard ones. These are probably very intelligent chimps.”
“All right,” Stephanie called.
“Try the female first,” Lewis said. “She keeps watching you. I think she wants to play.”
Jim led Zira to the screen. Stephanie lowered the screen to reveal a red cube. She raised the screen and placed a number of other objects with the cube: a red cone, a blue cube, red sphere, etc., then lowered it again. Zira promptly pointed to the red cube.
Stephanie smiled. “Very good.” She touched a button in the apparatus, and a compartment on Zira’s side opened. It had raisins, and the chimp ate them quickly, smacking her lips.
Lewis entered the cage, whistling softly to himself. “You can forget simple discrimination tests,” he said. “Those chimps are trained. Very well trained.”
“Sure about the others, Doctor Dixon?” Jim asked.
Lewis nodded. “I was watching them. They reacted when she reached for the cube. These chimps have been exposed to a lot of tests, Jim. We’d better make the next one tough.”
“Wonder if they can play games?” Stevie asked. She brushed long soft brown hair away from her eyes and put a hair clip back into place. “Tic-tac-toe? Some chimps can play it.”
Lewis shrugged. “That’s true. OK.”
They set an illuminated game board on the table. Stephanie handed Zira the stylus and nodded as the chimpanzee made a mark in the center square. “She knows the rules all right.”
“Try the male,” Lewis suggested. Jim took Cornelius by the hand and led him to the table.
Cornelius made a mark in the corner. Zira made another. Then Cornelius. Three moves later, Zira leaped up and held her hands clasped over her head, victorious boxer style. She chattered laughter.
“That settles that,” Lewis said. He took raisins from his pocket and gave them to Zira, then a smaller number to Cornelius. “Stevie, I’ve never heard of chimps who could play Tic-tac-toe by the rules. Not like that, waiting their turn to move—the best I’ve ever seen is a race to make three in a row. Those are the best trained chimpanzees I’ve ever heard of.”
“Is it just training, Lew? Couldn’t it be intelligence?”
“It’d be a whole order of magnitude higher than we expect of apes,” Lewis Dixon said. “OK. Let’s find out. Kroeger’s test.”
“Sure.” Stephanie helped him attach a banana to the ceiling. The ladder was removed from the cage. Then several boxes and a stick were laid on the cage floor.
The three chimps stared at the boxes, up to the banana, and out to Lewis and Stevie.
“Maybe they aren’t hungry,” Jim said. “Fed ’em a lot last night.”
“I think they’re too stupid,” Lewis said. “They were only trained, not intelligent. As I thought.”
Zira snorted. One of the other chimps squalled. Zira looked at the boxes for a moment, then attached two together. She added others until they formed a staircase, and, with the pole, would let her reach the banana. Zira climbed to the top of the box, used the stick to touch the fruit, and climbed back down again.
“But why didn’t she get it?” Stevie asked.
Zira turned to the girl. “Because I loathe and detest bananas.” Her voice was very clear and carefully controlled.
Cornelius shouted: “Zira!”
Stephanie sat very carefully at the desk outside the cage. “You all right?” Lewis asked. His own legs felt a little rubbery.
“Sure. It surprised me, that’s all. I don’t know why. It’s only a chimpanzee speaking English. We did hear that, didn’t we, Lewis?” She continued to sit at the desk.
“We surely did,” Lewis said. He turned to the chimps. “Can all of you talk?”
There was no answer at first. Then Zira said, “Of course we can. The others don’t want to while you’re here. Will you leave us alone for a minute?”
“Ye gods!” Lewis said. He motioned to the keeper who was standing as if carved from stone. They left the cage, locking it carefully behind them. “Come on, Stevie,” Lewis said.
“Do you think it is wise to leave them?” she asked. She struggled to her feet, surprised at how hard it was to stand.
“Yes. Now come on.” He put his arm around her waist as they went out the door at the end of the hall. The door closed behind them.
There was a long silence, “They may be listening to us,” Cornelius said at last.
“Nonsense,” Zira snorted. “If they knew how to make it possible to listen to us, they already knew we could talk. It is time we told them everything.”
Milo studied Zira’s face intently as he said, “Zira, are you mad?”
“Dr. Milo, please do not call my wife mad.”
“I did not call her mad, Professor Cornelius. I merely asked her if she had gone mad. And I repeat the question. Zira, are you mad?”
“No. But I hate deceit.”
“So do I,” Milo replied. “But there is a time for truth and a time, not for lies, but for silence. Until we know who is our friend and who is our enemy—”
“And how in God’s name do we find out if we won’t communicate?” Zira demanded. “We can speak. So I spoke.”
“We can also listen,” Milo said.
“No longer,” Cornelius reminded them. “Besides, did you not see the interest Dr. Lewis took in us? He already suspected something. He goaded Zira into making that staircase. With words. Already he half expected her to understand him. And Milo, what do we hear when we listen? A lot of psychiatric small talk.”
“We can also observe—”
“A display of primitive apparatus.”
“Primitive?” Zira gave the table a vicious kick. “It’s prehistoric. This junk wouldn’t test the intelligence of a newt.” She kicked the display again, and a leg fell off the table.
“Zira, for God’s sake, be calm,” Cornelius protested.
“I am calm.” She continued to kick the apparatus. “Why should I be upset? Our world is gone. We’re trapped here among primitive humans, possibly the only intelligent apes in the universe, and we’re locked in a cage that stinks of gorilla! Why shouldn’t I be calm? I am calm!” She delivered another vicious kick.
“Now you’ve disturbed Milo,” Cornelius said, fighting to remain calm himself.
Milo screwed his clenched fists into his eyes as he paced in frustration. He walked as far from the other two as he could, until he was stopped by the bars separating their cage from the gorilla. Then he faced them angrily. “For God’s sake, stop fighting! It’s too late anyway. Now they know. We’ve got to think what we ought to tell them.”
“You don’t have to shout at me!” Zira snapped.
“I am NOT SHOUTING!” Milo shouted. He shook himself. More quietly, he said “Use your heads and start thinking.”
“Milo, look out!” Cornelius shouted. He rushed forward, but not in time. The gorilla in the next cage had reached through the bars and seized Milo. It held him against the bars and laughed.
“MILO-O-O-O!” Zira screamed. “Milo! Cornelius, help him!”
The door opened and Lewis Dixon came in. He saw the situation and shouted to the keeper. “Get your pistol, Jim! Quick!” Dixon rushed forward to the gorilla cage and began to open the door. He waved to distract the gorilla, shouted, anything to make it release the chimpanzee. It did nothing, but continued to hold Milo, squeezing tighter, not moving.
“He’s killing him!” Zira shouted. The two chimpanzees were trying to pull the gorilla’s hands away from Milo’s throat. “We’re not strong enough!”
Jim Haskins came up with a .32 automatic. He looked on in confusion.
“Shoot, Jim!” Dixon commanded.
“That’s a valuable animal,” Haskins protested. He stood there, paralyzed.
“Damn it, so are the chimps!” Dixon screamed. “Shoot the damned gorilla!”
Jim shuffled about in indecision. The two Marines had rushed into the room and stood outside the cage, uncertain of what to do.
“Shoot the gorilla!” Dixon commanded.
One of the Marines raised his rifle. He fired, slowly, three times. Bright splotches appeared on the gorilla’s chest. It looked up, surprised, but it did not release Milo.
“Again!” Dixon ordered.
Jim Haskins came into the cage. With a sad look he placed his pistol against the gorilla’s head and fired. The shot was not very loud after the blast of the Marine’s rifle.
The gorilla convulsed and staggered backward, his grip about Milo’s neck relaxed at last.
Milo fell in a shapeless heap. He did not move.