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Little information exists on the diet of the Common Black Hawk (Buteogallus anthracinus) in Mexico. We provide the first documented observation of predation on a crab by the Common Black Hawk in a mangrove swamp on the coast of Oaxaca, Mexico. On 24 April 2023, at 09:00 h, we observed a Common Black Hawk fly out of the mangrove swamp with a crab between both feet. We observed for 15 mins while the hawk consumed the crab on a post. We identified the Blue Land Crab (Cardisoma crassum) by the characteristic blue color of the shell, and orange claws and belly. Our observation contributes to knowledge of the diet of the Common Black Hawk and its consumption of a crab species that bioaccumulates metals and metalloids. This opens the possibility of conducting research to assess the risk of transfer and bioaccumulation from prey to predator that could compromise the conservation status of this raptor. [ABSTRACT FROM AUTHOR]

Interactions between species and individuals can determine their survival in the wild. Most of the time these relationships are difficult to study in situ by direct observation. However, technology can help collect these data with minimal impact on animals' behaviour. Egg stage is certainly the most vulnerable life stage in crocodilians, but few studies have focused on animal species visiting crocodilian nests and associated egg predation. Herein, we use camera-traps in four Mexican states (Chiapas, Oaxaca, Jalisco, Tabasco) to determine vertebrate species and egg predators associated with wild nests of Caiman crocodilus chiapasius, Crocodylus acutus and Crocodylus moreletii. We recorded 72 species of vertebrates at nesting sites and obtained the first photographic evidence of crocodilian egg predation by Caracara cheriway, Cuniculus paca, Didelphis virginiana and Procyon lotor. We also identified commensalism, cooperation, and predation as types of interactions within observed nesting areas, which indicates the importance of crocodilian nesting areas for other wild vertebrates. Finally, we found that crocodilian egg predation depends on species richness present in the area of study, as well as crocodilian size. [ABSTRACT FROM AUTHOR]