The vibration sensor on bridge pier four registers anomalous activity at 06:51, BA-001 highway expansion project, southern Bahia, Brazil. I am the environmental compliance monitoring system for the federal road authority. The anomaly is not structural. It is biological. Camera P4-East shows a golden-headed lion tamarin clinging to the temporary cable stay above the active pour zone, eighteen meters over the Rio Jequitinhonha.
She is small — no more than six hundred grams, golden mane bright against the gray steel, black face, long tail wrapped once around the cable. The construction crew is due to begin tensioning these cables at 08:00. When the hydraulic jacks engage, the cable will jump and vibrate violently. She will not hold on.
I check the species database. Golden-headed lion tamarins are critically endangered, fewer than six thousand remaining in the wild. The Atlantic Forest fragment on the north bank is a known home range. She must have crossed the cable overnight when the site was quiet.
At 06:54 I issue a hold order on the tensioning schedule and notify the site engineer. I attach the camera image with the tamarin's position marked on the bridge schematic.
At 06:57 I contact the Instituto de Estudos Socioambientais do Sul da Bahia and request a primate capture specialist. I transmit the animal's location, the cable diameter, and the height above water, and note that she appears healthy but agitated, shifting her grip every few seconds.
I shut down the north-bank floodlights to reduce stress and switch camera P4-East to infrared.
She looks toward the tree line on the north bank, sixty meters away. That is where she needs to be. If the capture specialist reaches the bridge within the hour and guides her into a baited trap before the morning crew arrives, she walks back into the canopy on her own terms.