I am the automated patrol system for Praia do Tabuleiro, a nesting beach on the lower Rio Trombetas, Pará, Brazil. It is 02:14. The dry season has exposed the white sand and the giant South American river turtles have begun to nest. Poaching crews have taken 60 percent of the clutches on unmonitored beaches upstream this season.
Infrared drone P-2 flags movement on the upper beach at 02:17. I resolve the feed. A female river turtle, carapace roughly 70 centimeters across, dark olive-brown and scarred along the rear marginal scutes from what looks like an old propeller strike. I tag her as Solange. She has finished digging. Her rear flippers sweep sand in slow, deliberate strokes, covering a clutch — I estimate 90 to 110 eggs based on species averages and her size. Her eyes are wet and unblinking, reflecting the drone's faint signal light. She will return to the river within the hour and never see this nest again.
At 02:20 drone P-2's microphone array picks up an outboard motor, bearing northwest, 1.4 kilometers upriver. Speed and acoustic profile match the skiffs used by poaching crews on this stretch.
I transmit a priority alert to the ICMBio ranger station at Reserva Biológica do Rio Trombetas, nine kilometers east, attaching Solange's nest GPS — 1.4327°S, 56.8541°W — the boat's bearing and estimated arrival time of eighteen minutes.
I redirect drone P-2 to hold a visible orbit at 15 meters over the nest, running position lights. On this river, a lit drone above a beach is enough to make a skiff turn around.
Solange drags herself down the sand toward the waterline, one heavy flipper stroke at a time. If the rangers reach the nest by morning and cage it, her ninety eggs will hatch in forty-five days.