Andrea Morales Rozo, who teaches biology at the Universidad de los Llanos in central Colombia, guided the crew at the nets, from which she skillfully extricated birds unharmed. Ms. Morales Rozo has been learning the blackpoll warbler, a species that migrates involving the Amazon and Canada she was component of a group that not long ago in contrast museum specimens and discipline-caught birds and realized that the warbler’s northward variety experienced shifted by just about 400 miles in 45 several years.
Dr. Cuervo, the expedition chief, provided quiet, fatherly assist to individuals at the processing desk. It is not always obvious how greatest to describe a bird’s hues, for instance, and next opinions were being usually asked for. Was a wing “verde café,” greenish brown? Or was it “verde olivazo,” olive green? Was a female bird’s brood patch, the bare skin that warms the eggs, continue to sleek or turning into wrinkly?
MOR-001 struggled in Ms. Soto’s hand as she handed it to her colleague, Jessica Díaz, a subject biologist hired for the expeditions. The bird was photographed and logged. Ms. Díaz labored to extract a tiny quantity of blood from its jugular vein with a syringe, expressing the drops into a vial of alcohol. She then ready herself to euthanize it with speedy cardiac compression, using fingers to utilize company tension above the bird’s heart. With this technique, compact birds go out in seconds and die in about half a moment. Big birds are anesthetized.
Ms. Díaz held MOR-001 beneath the desk so as not to have to observe her colleagues did the very same each time their convert arrived to sacrifice a hen. “This is the not-enjoyment part,” she reported, softly.
A couple in the group, which include Ms. Soto, steer clear of sacrificing birds, although they believe that in the requirement of scientific amassing and participate in the course of action. “I assume it’s hard on all of us,” said Ms. Soto, whose higher, mellifluous voice gave her a specified birdlike aura. “But it’s actually tricky on me. It just stabs me through the heart.” On this expedition, Ms. Soto assumed other careers on the assembly line: slicing samples of pectoral muscle to drop into liquid nitrogen, calling out hues of beaks and feathers, gingerly tagging a leg.