Summary Although drones are becoming very common in the skies, most concerns about their use not focused on possible impact wildlife. We used information available from scientific literature effects of wildlife and complement it with Internet (YouTube) to evaluate whether recreational activities using produce behavioural responses Scientific papers specifically evaluating scarce but increasing. Nonetheless, we found abundant videos which many species different taxonomic groups multiple...

Both wing size and shape affect the flight abilities of birds. Intra inter‐specific studies have revealed a pattern where high aspect ratio low loading favour migratory behaviour. This, however, not been studied in soaring migrants. We assessed relationship between characteristics habits turkey vulture Cathartes aura , an obligate migrant. compared with migration strategy among three fully migratory, one partially non‐migratory (resident) population distributed across American continent....

In recent decades, there has been a growing interest in integrating the social sciences and conservation studies to inform more realistic management approach. Indeed, an understanding of people's perception fauna helps evaluation possible conflicts with humans, provides tools solve these conflicts. However, perceptions may change along different parts species' geographical distribution. Scavenger birds are not exempt from as many farmers blame them for attacking killing livestock. We...

Bird migration in the Neotropics is complex and highly diverse. Indeed, for many taxa, basic questions such as where they go are still relevant. Satellite-tracking studies of Turkey Vulture (Cathartes aura) have revealed extensive variability their movement strategies, contributing to widespread distribution. However, South American migratory populations among least explored. By integrating five years satellite-tracking data, citizen science databases classical raptor monitoring techniques,...

The food provided to South Polar Skuas (Stercorarius maccormicki) chicks was determined at two Antarctic sites where breed sympatrically with Brown (S. antarcticus). At Harmony Point on Nelson Island, 16 samples of regurgitated stomach contents were analyzed, all contained remains penguin (mostly soft tissues), which constituted the bulk contents, while only had fish or krill remains. These access colonies, they hunted fed fresh carcasses. However, Half Moon out nine minor amounts major...

Where South Polar Skuas (Stercorarius maccormicki) occur in the absence of Brown Skua (S. antarcticus), their main prey consists other birds. In contrast, where two species together, fish appears to dominate diet Skuas, probably because monopolise terrestrial resources. Twenty-eight stomach samples were collected throughout breeding season at Half Moon Island, Shetland Islands, Antarctica. Fish most dominant item (100% frequency, 98% mass); importance remained constant study period. Although...

Seabirds are mostly thought to moult during the inter‐breeding period and isotopic values of their feathers often therefore assumed relate assimilated diet such periods. We observed Brown Skuas Stercorarius antarcticus lonnbergi South Polar maccormicki moulting on a breeding site at King George Island, Antarctica. This raises concerns about reliability using stable isotopes in infer feeding localities birds period. analysed δ 13 C 15 N growing fully grown body collected from same...

Abstract Monomorphic birds cannot be sexed visually and discriminant functions on the basis of external morphological variations are frequently used. Our objective was to evaluate reliability sex classification created from structural measurements Chilean flamingos Phoenicopterus chilensis museum skins for gender assignment live birds. Five were used develop four functions: culmen, bill height width, tarsus length middle toe claw. The tested a sample zoo. best given by function using length,...

Summary The Olrog’s Gull Larus atlanticus is an endemic and threatened species of the south-western Atlantic. Little known about its movements during non-breeding period. objective this study was to analyse migration by tracking adults from Bahía San Blas (Buenos Aires province, Argentina) with geolocators using information sightings ringed gulls. Differences between males females were evaluated data used determine age differences. A single core area (kernel 50%) 21 tracked birds identified....

The diet of chicks may change according to their growth and also vary between siblings due competitive relationship. Diet composition 81 Brown Skua (Stercorarius antarcticus lonnbergi) was analysed from regurgitated stomach contents in order determine changes related chick age differences siblings. Fifty-nine the samples belonged whose estimated by applying culmen measurement a regression function. remaining 22 11 sibling pairs were simultaneously sampled. constituted mostly soft tissues...

Nest structure and location must maximize the benefit provided to chicks through isolation from environment as well protection against predators. The Yellow-winged Blackbird (Agelasticus thilius) builds open nests intertwined trowel vegetation in marshlands. height which these birds build nest thickness of their lateral walls base were studied look for a pattern that relates characteristics. Nests built lower half bulrush canes positive correlation between distance cane tip was found. both...

Changes in seasonal resource availability and energetic requirements as offspring grow may force parents to change their trophic ecology throughout the breeding season. Brown skuas Stercorarius antarcticus breed a highly environment where of main food changes during We studied feeding plasticity brown by assessing isotopic diet movement patterns at different stages cycle. Blood δ 15 N values indicated that penguin chicks Pygoscelis spp. Antarctic krill Euphausia superba constituted most (up...