The Southern Caracara (Caracara plancus) is a South American falconid that over the years has been colonizing open areas of the Southwestern Amazon. Regarding food habits, it is considered an opportunistic/generalist species. Caracara plancus has a varied diet, composed of animal protein, including carcasses. It also consumes plants, although this behavior appears less frequently in the scientific literature. Here we present a report of a Southern Caracara feeding on peach-palm fruits (Bactris gasipaes) in the rural area of Brasiléia, state of Acre, Brazil. The peach-palm tree is a common species, cultivated for obtaining heart of palm (“palmitos”) and fruits for consumption and regional marketing. Besides being a new food item in the Southern Caracara diet, the observed behavior indicates that C. plancus can potentially become a plague to the regional culture of peach-palm.

The Southern Caracara (Caracara plancus) is a South American falconid that over the years has been colonizing open areas of the Southwestern Amazon. Regarding food habits, it is considered an opportunistic/generalist species. Caracara plancus has a varied diet, composed of animal protein, including carcasses. It also consumes plants, although this behavior appears less frequently in the scientific literature. Here we present a report of a Southern Caracara feeding on peach-palm fruits (Bactris gasipaes) in the rural area of Brasiléia, state of Acre, Brazil. The peach-palm tree is a common species, cultivated for obtaining heart of palm (“palmitos”) and fruits for consumption and regional marketing. Besides being a new food item in the Southern Caracara diet, the observed behavior indicates that C. plancus can potentially become a plague to the regional culture of peach-palm.

Our study provides information on the breeding and biometrics of Rusty-Margined Flycatcher Myiozetetes cayanensis in southwest Brazilian Amazonia. Myiozetetes cayanensis is distributed from Central America until north of South America. We made observations on reproduction and captures of this species in a terra firme forest fragment in the state of Acre, between 1999 and 2020 and we evaluated the breeding season in Brazil through citizen science data. We monitored nine nests between 2012 and 2020, built at a mean height of 1.8 m above ground. Clutch size was two, three or four eggs, incubated for 15 days. We monitored the development of six nestlings: minimum hatch weight was 2 g and young fledged with a mean mass of ca. 25.5 g. The constant growth rate (K) of nestlings was 0.18 with a growth asymptote of 22.8 g. Daily survival rate was 90% and 100% during the incubation and nestling per...

Reportamos los primeros datos sobre la anidación y desarrollo de Dendroplex picus peruvianus en un fragmento de bosque en el suroeste de la Amazonia. Observamos y capturamos esta especie entre 1999 y 2019. Encontramos dos nidos activos en 2012 y 2013, pero monitoreamos solo uno. El tamaño de la camada fue de dos huevos incubados durante 16 días. La tasa de crecimiento constante (K) de los polluelos fue de 0.31 con una asíntota de crecimiento de 46.3 g. Registramos una longevidad mínima de ocho años. Nuestros datos mostraron que D. p. peruvianus se reproduce principalmente en la temporada de lluvias (septiembre–marzo) superponiéndose con el periodo de cambio de pluma.

We present new aspects of breeding biology of Gray-fronted Dove Leptotila rufaxilla, from five nests found between 2012 and 2014 in a lowland forest fragment in southwestern Brazil. The nests simple/platform shape were built at a mean height of 1.90 m above ground. The clutch size was two eggs white and elliptic, incubated for 15 days (based on three nests). We recorded predation in two nests still in incubation phase. Minimum hatch weight of nestlings was 10 g and young fledged with a mean mass of 56 g. The constant growth rate (K) of nestlings was 0.40 with a growth asymptote of 60.7 g. Daily survival rate, Mayfield and apparent nesting success in the incubation period was 90, 20 and 56%, respectively, while in the nestling period were all 100%. Our data and the contribution of citizen science showed that L. rufaxilla breeds over the year, mainly in the rainy season, both in southweste...

La deformidad del pico es una característica rara y tiene una frecuencia baja, con 0.5% de casos en poblaciones de aves silvestres. Además de ser raras, las deformidades del pico también son escasamente reportadas en la literatura científica brasileña. Reportamos aquí deformidades en los picos de aves de las especies: Dendrocincla merula, Amazona ochrocephala y Pheugopedius genibarbis, en los cuales todos los registros ocurrieron en el sudoeste de la Amazonia brasileña. Los dendrocoláptidos hacen uso intensivo del pico en la búsqueda de insectos y pequeños vertebrados, explorando en grietas de la madera con golpes laterales. En el caso aquí presentado, este comportamiento de exploración pudo haber sido la causa de la rotura de la punta del maxilar de este individuo. En el territorio brasileño, pocas especies de loros fueron registradas con deformidad en el pico y en el indiv...