RESUMEN Presentamos 62 localidades con la mayor cantidad de individuos de cóndor andino (Vultur gryphus) en el Perú, que deberían ser consideradas como lugares de conteo para realizar un monitoreo nacional orientado a estimar el número de cóndores andinos en el país. For this reason, we recommend that simultaneous counts be conducted from the localities we present here. Despite the fact that the most effective way for estimating population size of Andean condors is by performing direct counts at communal roosting sites, we argue that the known number of roosting sites in Peru is still too low to allow a precise estimation of total number of individuals. These localities were separated at least 57 km to reduce biases derived from duplicate counting of individuals during counts or censuses. These localities were selected by combining citizen science data available in ebird, with daily distances of movement obtained from one adult male condor fitted with a satellite transmitter between October 2015 and September 2016. We present 62 localities with the highest number of recorded Andean Condor (Vultur gryphus) individuals which should be included as counting stations to estimate population size of the species in Peru. Long-term monitoring of communal roosts across the Andean condor's range is essential for the monitoring of this rare and vulnerable species. Condors had large aggregations in some communal roosts and used the area seasonally, increasing in numbers from autumn to spring and decreasing in summer. This population, the largest known of this species, comprises 68.5% adults and 31.5% imma-tures. 6,300 km 2 I obtained a minimum population size of 246 individuals by direct observation, and a population estimate of 296 condors (range 260–332) by applying the models. I fitted the data to two asymptotic models to calculate the population of condors as a function of the number of communal roosts surveyed. Simultaneous censuses of 10 condor communal roosts were therefore conducted during 2006–2008 in north-west Patagonia, Argentina, to obtain a minimum population number, to estimate the size of the local population, and to describe use of the roosts by season and age classes.
The current estimate of the population of the Andean condor Vultur gryphus is based on limited local counts.
Estimations of the population sizes of threatened species are fundamental for conservation.
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