The density-related permanence test (DRP) is used to classify young birds (while in groups) according to their individual permanence in proximity to either a high or low density of conspecifics (HD or LD, respectively). The birds' performance in DRP was associated with underlying differences in the social responses of their individuals. Quails in homogeneous groups of LD residents responded with less compact groups and higher levels of agonistic interactions to the presence of an intruder, and showed higher levels of agonistic interactions among cagemates than the homogeneous groups of HD birds. This study deepen the characterization of DRP evaluating whether contrasting behavior during test is associated with birds' stress responses to challenging situations during rearing. Plasma corticosterone responses were individually assessed after submitting DRP categorized birds to a brief (10 min) partial restraint (mechanical stressor; experiment 1), or after introducing them during 5 min as intruders in homogeneous groups of 6 unknown same category (HD or LD) conspecifics (social stressor; experiment 2). Experiment 1 showed that basal corticosterone levels were similar in all groups and the partial mechanical restraint induced an increase in plasma corticosterone concentration also in all groups. However, the increase induced by the stressor was higher in the LD birds than in their HD counterparts. In experiment 2, compared to controls, social stressor showed no plasma corticosterone changes in the intruders that were introduced in an unfamiliar group of HD conspecifics. However, intruders (both HD and LD) that were visiting the LD residents showed an increased corticosterone response compared to their control counterparts. Results suggest that categorization of birds in the DRP test could have relevance for selection programs oriented to obtain birds better suited to intensive rearing conditions that includes high density of animals and exposure to unavoidable stressors.

R������.La reintroducción de mamíferos fosoriales coloniales en sitios con madrigueras de uso permanente podría estar limitada por disponibilidad de madrigueras satélite donde refugiarse de los depredadores mientras se alimentan, y por disponibilidad de pastos cortos. A fin de generar información para asistir a la reintroducción de vizcachas (Lagostomus maximus), nos preguntamos: 1) ¿qué madrigueras satélite aceptan en función de su complejidad, el tamaño de la entrada y la distancia a madrigueras de uso permanente?, y 2) ¿cómo es afectada el área de pastoreo por la provisión de madrigueras y el corte de pasto? Realizamos el estudio en las Sierras de Córdoba con 13 vizcachas trasladadas a dos corrales de adaptación equipados con madrigueras permanentes. Cavamos 14 madrigueras satélite de dos tipos: simples con solo un túnel y complejas con túnel y cámara subterránea, todas ubicadas a distancias de 1 a 16 m de los corrales de adaptación. Además, cortamos parte de la vegetación. Por seis meses luego de la liberación evaluamos el grado de ocupación de madrigueras satélite. Además estimamos número de heces, suelo desnudo y altura de la vegetación en transectas de 15 m de largo con origen en las madrigueras más usadas que estaban repartidas en dos sectores. El grado de ocupación fue de 2 y 67% para las madrigueras satélite simples y complejas, respectivamente, y se relacionó negativamente con el tamaño de la entrada a la madriguera compleja. No hubo relación entre el grado de ocupación de la madriguera y la distancia a los corrales. El muestreo en transectas reveló que 91% de las heces contabilizadas estaban a 4 m o menos de las madrigueras más usadas, y que preferían el pasto cortado al no cortado. Concluimos que para aumentar área de pastoreo es conveniente construir madrigueras satélite complejas y cortar el pasto.[Palabras clave: traslado, traslocación, refugios, manejo de hábitat, liberación blanda] A�������. Assisting vizcacha (Lagostomus maximus) reintroduction: How to increase their safe foraging range? The reintroduction of fossorial mammals could be limited by the availability of satellite burrows that provide refuge from predators while foraging away from their permanent burrows, and by availability of short grasses. In order to generate information to assist in the reintroduction of vizcachas (Lagostomus maximus), we asked: 1) what type of satellite burrow do they accept based on burrow complexity, entrance size and distance from permanent burrows?, and 2) how did the provision of burrows and mowing affect their foraging range? We carried out the study in the Sierras of Cordoba, Argentina, with 13 vizcachas transferred to two adaptation pens equipped with permanent burrows. We mowed part of the vegetation around the pens and we dug 14 satellite burrows of two types: simple with only a tunnel, and complex with a tunnel and underground chamber. Burrows were situated between 1 and 16 m from the pens. For six months we evaluated satellite burrow occupancy. We also counted feces, estimated bare soil, and height...