Pip knew the flight whistle. He knew the empty glove meant land and the closed glove meant wait. He also knew that Nuri had hidden a pear slice in her sleeve.
He stood on the launch shelf and looked at the sleeve.
“He has trained you,” Dax said.
“We’ve reached an agreement,” Nuri replied.
They lived on Europa, an icy moon of Jupiter. The canyon below them was built inside a sealed research shelter. It had flat ledges, planted reeds and a river narrow enough to step across. A tough inner roof held in the air. Another roof above it blocked harmful radiation.
Outside waited ice and almost no air. Pip could breathe and fly only inside. Jupiter occupied the camera screen by the entrance. No window exposed the animals to its actual light.
Pip was the smallest of six horse-shaped creatures grown for the Pegasus survey project. His pale wings were thin skin stretched over light, jointed bones. He weighed less than a large dog. He could glide through the shelter’s thick air and carry a tiny camera. Fans made a stream of warm air rise in the canyon. That lift could carry him higher for a short time. He could not carry a person. Nuri, the habitat veterinarian, had repeated that last distinction until the publicity department stopped asking for saddles.
Dax, the shelter’s engineer, needed a film of the far canyon before the people paying for the project reviewed its progress. The older creatures would circle the near terraces, but none had followed the warm lift into the canyon’s deep bend. A flying camera could show the inner roof there. To inspect it on foot, Dax would have to close a large part of the shelter.
Pip’s keeper, Ilo, had trained him toward that bend for weeks. Now Ilo waited by the landing perch, one gloved hand open. That was his signal to return. Ilo wanted him back safely. They had told Nuri this in words so plain that she had been offended.
“I’m not asking him to die,” she had said.
“You’re asking him to go where he doesn’t want to.”
Now Nuri brought out the pear. Pip walked after it to the shelf’s edge, spread his wings and launched. He drifted easily across the first terrace. At the mouth of the warm current, he tilted, swung away and landed on Ilo’s glove.
Dax’s recorder marked FLIGHT INCOMPLETE.
Nuri wanted to scratch out the word.
“Again,” she said.
Ilo fed Pip a small piece of pear, checked his wing edges and declined to put him on the launch shelf.
“What changed since the last time?”
“Nothing.”
“Then why would he?”
Dax was studying the air monitor. It showed pressure within the permitted range. Nuri could see a wrinkle in a patched roof seam. It had appeared when the shelter warmed and cooled the day before. Dax had checked the nearer parts. His air sensors sat at fixed points, far apart. None measured the air right beside that wrinkle.
“It could be the camera harness,” he said.
They removed it. Pip made the same turn.
They shut off the warm current. He glided toward the bend, lost height before reaching it, and took the low perch on the second terrace. This time Ilo walked down to meet him. No one called the whistle until they were beside him.
Nuri sat on the shelf and watched the loose reed ribbons near the far wall. With the current off, most hung straight. One drew toward the creased seam.
When the current resumed, the ribbon snapped outward. Pip flattened his ears from across the canyon.
“Leak?” Nuri asked.
Dax enlarged the picture from the wall camera. A support arch hid the seam. The moving ribbon suggested air was escaping there, but the camera could not show a hole.
“If I close the section now, I can inspect it tomorrow,” he said. “No survey flight for review.”
Nuri pictured the report she had promised: sustained exploration by a living flyer adapted to the canyon. She had called Pip’s return a failure before knowing why he returned.
“Close it if we need to,” she said. “First, can we film from the safe side?”
Ilo looked at the near ledge, then at Pip.
“The short route he already takes. Not through the current.”
They fitted the lightweight camera again. Ilo placed a landing perch just before the support arch, before the first visibly deflected reed ribbon. They walked the path with Pip on their arm, letting him look. The shelf, the near terrace, the perch and Ilo’s glove formed a route he had flown in pieces. They would ask for one short glide. The ribbons along that route hung still, clear of the leak’s pull. Ilo would call him back if he went beyond the perch.
Nuri held no hidden fruit this time. Pip stepped onto the shelf, waited, then opened his wings.
He crossed the first terrace. Near the arch his camera showed the edge of the roof lining lifting from its seam. He turned before entering the stream and came back low, landing on Ilo’s arm hard enough to push them sideways.
Ilo sat on the floor with Pip against their chest. Nuri knelt and checked his wings. Dax stopped the recording before moving the screen to show them the lifted seam.
It was enough. The section closed. Dax and the repair crew worked behind its sealed partition while the animals stayed in the near habitat. The project missed its long-flight target.
Nuri wrote that in the report. Then she described the short flight, the observed defect and the conditions under which Pip had chosen to return. She removed her earlier sentence claiming endurance was established.
“They might cut the project,” Dax said.
“They might.”
He added his name to the defect record. Their repaired roof lining would be part of the review too.
Two days later Ilo moved the perch back to the launch shelf. The current was still off. Pip flew the short circuit with the camera aboard, passing the repaired seam at a distance and returning without haste.
Nuri watched from the floor. She had a pear slice in plain sight. Pip landed beside Ilo’s open glove, looked toward her, and folded his wings.
She waited for him to come the rest of the way.
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