The avian scavenger raptors guild of Patagonia, the southernmost region of South America (37–56°S), comprises 3 species of obligate scavengers and 7 species of facultative scavengers. Despite the species richness, there is little information about the anthropogenic threats this guild might face. Here, based on 164 h of observations and photographic records across 3 austral winters, we reveal a broad range of lesions (missing legs, digits or talons, fractures, luxations, pododermatitis, necrosis, hyperkeratosis, and beak and ocular lesions) and mortalities among scavenger raptors in Argentine Patagonia at 2 anthropogenic food-rich sites located 1,750 km apart at 38° and 54°S. We photographed 146 individuals with 174 physical lesions and found 61 dead individuals, including one obligate scavenger species (Black Vulture, Coragyps atratus) and 4 facultative scavenger species (Crested Caracara, Caracara plancus; Chimango Caracara, Daptrius chimango; White-throated Caracara, D. albogularis; and Black-chested Buzzard-Eagle, Geranoaetus melanoleucus). Ninety percent of the lesions we recorded on the individuals were located on their hindlimbs. None of the carcasses we found exhibited any apparent lesions. The precise nature and origins of these lesions and mortalities remain uncertain. However, the hindlimb lesions align with the effects of leg-hold traps, while poisoning emerges as the most likely cause of mortality among individuals foraging at these anthropogenic food-rich sites. These findings suggest a notable human-induced threat to the avian scavenger raptors guild in Patagonia.

You do not currently have access to this content.