Observation of predatory infanticide by a solitary female brown bear
The killing and consumption of young in ursids is usually carried out by unrelated males. Females also exhibit this behavior, but existing observations are limited to females with offspring. This report presents an observation of a solitary adult female brown bear (Ursus arctos), bear 175, killing and consuming a yearling in Peter Lougheed Provincial Park, […]
Intelligent bear deterrence system based on computer vision: Reducing human–bear conflicts in remote areas
Human–bear conflicts on the Tibetan Plateau threaten both local livelihoods and the conservation of Tibetan brown bears (Ursus arctos pruinosus). To address this challenge, we developed a low-power, network-independent deterrence system that combines computer vision with Internet of Things (IoT) hardware. The system integrates a YOLOv5-MobileNet detection model deployed on a low-power edge artificial intelligence […]
Demography of American black bears in a semiarid environment
The American black bear (Ursus americanus) has one of the broadest geographic distributions of any mammalian carnivore in North America. Populations occur from high to low elevations and from mesic to arid environments, and their demographic traits have been documented in a wide variety of environments. However, the demography of American black bears in semiarid […]
High-resolution techniques reveal the palaeoecology of an exceptionally large Ursus arctos from the Late Pleistocene of East Siberia
Cementum and dentin increment analysis and dental microwear analysis were used for the first time to study the dental remains of a giant brown bear (Ursus arctos) from the Late Pleistocene of Yakutia, Russia. Dental increment analysis showed that this bear died during the warm season (May–Sep) in the prime of its life—at the age […]
Testing the use of remote cameras to index body condition in brown and black bears
Body condition of large mammals is a highly labile parameter that is influenced by recent nutrition, the seasonal hormonal cycle, intrinsic traits such as age and reproductive status, and extrinsic stress factors such as predation risk, social dominance, or human disturbance. Body condition thus integrates many population- and individual-level factors into a single measure of […]
Edible ant availability and distribution as resources for the Asiatic black bear
The Asiatic black bear (Ursus thibetanus) is a generalist omnivore consuming a wide range of food items, including ants (family Formicidae) and other social insects during summer. The distribution of ant resources is thought to influence habitat selection by Asiatic black bear. We investigated the distribution of ant resources during summer in bear habitat in […]
Noninvasive genetic assessment of sloth bear diversity and population structure in Nepal
The genetic diversity of wildlife populations is crucial in maintaining their fitness and resilience to environmental changes and disease. Despite their rarity, ecological importance, and being an endangered species of public concern, information on sloth bears (Melursus ursinus) from Nepal is limited, and they are yet to receive conservation priority. To address this gap, we […]
Sloth bear denning behavior in eastern Karnataka, India
Eastern Karnataka, India, has abundant sloth bear (Melursus ursinus) habitat made up of rocky scrub jungle and an abundance of naturally occurring caves, which the bears use for resting (day) and natal or neonatal dens. We deployed cameras on active dens from 2014 to 2018 and collected sloth bear resting and maternal denning behavior. We […]
Denning black bear response to anthropogenic disturbance and implications for cub survival in Florida
Wildlife research and management can be disruptive to wildlife. By advancing our understanding of the impacts of these activities, we can reduce adverse effects, improve decision-making, and enhance the outcomes of research and management. During 2017–2019, we observed the responses of denning female American black bears (Ursus americanus) to 3 types of routine research and […]
Bonding behavior of sister brown bears with different-aged offspring
This paper documents and describes the behavior of 2 sibling female brown bears (Ursus arctos) and their cubs as they bonded at Brooks River in Katmai National Park, Alaska, USA. Between mid- August and October 2022 the adult female bears and their cubs behaved much like a single family. The same-aged mothers each had a […]