We observed a putative case of empathy among wild black-fronted titi monkeys (Callicebus nigrifro... more We observed a putative case of empathy among wild black-fronted titi monkeys (Callicebus nigrifrons) from two different groups (D and R). In over 10 years of behavioural observations of five habituated groups of this species, only low levels of inter-group tolerance have been observed. However, on one day, we encountered the adult male from group D limping (poor hind limb motor coordination) as he travelled alone along the ground. Interestingly, we observed that members of group R did not express any agonistic behaviour towards this neighbouring male and apparently allowed this disabled individual to follow them in the forest for over 5 h. They stayed low in the forest (< 2 m above the ground) and < 10 m horizontally from the individual, and remained in visual contact with him. At the end of the day, this male from group D slept in the sleeping site of group R and was groomed by the adult female of group R. Such tolerance between members of different groups has never been previously observed in this species. Furthermore, group R exposed themselves to increased predation risk by staying close to the ground for protracted periods. The behaviour of group R could be interpreted by as a putative case of empathic responding in this species.
The wild boar is one of the worst invasive species in the world. This study record... more The wild boar is one of the worst invasive species in the world. This study records the presence of the species in fragments of the Atlantic forest in Southeastern Brazil. These records extend the distribution of this species in the country and provide the first record in the wild, in Rio de Janeiro State. The potential impacts on the native biodiversity caused by the invasion of this exotic species are briefly discussed.
We observed a putative case of empathy among wild black-fronted titi monkeys (Callicebus nigrifro... more We observed a putative case of empathy among wild black-fronted titi monkeys (Callicebus nigrifrons) from two different groups (D and R). In over 10 years of behavioural observations of five habituated groups of this species, only low levels of inter-group tolerance have been observed. However, on one day, we encountered the adult male from group D limping (poor hind limb motor coordination) as he travelled alone along the ground. Interestingly, we observed that members of group R did not express any agonistic behaviour towards this neighbouring male and apparently allowed this disabled individual to follow them in the forest for over 5 h. They stayed low in the forest (< 2 m above the ground) and < 10 m horizontally from the individual, and remained in visual contact with him. At the end of the day, this male from group D slept in the sleeping site of group R and was groomed by the adult female of group R. Such tolerance between members of different groups has never been previously observed in this species. Furthermore, group R exposed themselves to increased predation risk by staying close to the ground for protracted periods. The behaviour of group R could be interpreted by as a putative case of empathic responding in this species.
The wild boar is one of the worst invasive species in the world. This study record... more The wild boar is one of the worst invasive species in the world. This study records the presence of the species in fragments of the Atlantic forest in Southeastern Brazil. These records extend the distribution of this species in the country and provide the first record in the wild, in Rio de Janeiro State. The potential impacts on the native biodiversity caused by the invasion of this exotic species are briefly discussed.
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groups of this species, only low levels of inter-group tolerance have been observed. However, on one day, we
encountered the adult male from group D limping (poor hind limb motor coordination) as he travelled alone
along the ground. Interestingly, we observed that members of group R did not express any agonistic behaviour
towards this neighbouring male and apparently allowed this disabled individual to follow them in the forest for
over 5 h. They stayed low in the forest (< 2 m above the ground) and < 10 m horizontally from the individual,
and remained in visual contact with him. At the end of the day, this male from group D slept in the sleeping site of
group R and was groomed by the adult female of group R. Such tolerance between members of different groups
has never been previously observed in this species. Furthermore, group R exposed themselves to increased predation risk by staying close to the ground for protracted periods. The behaviour of group R could be interpreted
by as a putative case of empathic responding in this species.
of the species in fragments of the Atlantic forest in Southeastern Brazil. These records extend the distribution
of this species in the country and provide the first record in the wild, in Rio de Janeiro State. The potential
impacts on the native biodiversity caused by the invasion of this exotic species are briefly discussed.
groups of this species, only low levels of inter-group tolerance have been observed. However, on one day, we
encountered the adult male from group D limping (poor hind limb motor coordination) as he travelled alone
along the ground. Interestingly, we observed that members of group R did not express any agonistic behaviour
towards this neighbouring male and apparently allowed this disabled individual to follow them in the forest for
over 5 h. They stayed low in the forest (< 2 m above the ground) and < 10 m horizontally from the individual,
and remained in visual contact with him. At the end of the day, this male from group D slept in the sleeping site of
group R and was groomed by the adult female of group R. Such tolerance between members of different groups
has never been previously observed in this species. Furthermore, group R exposed themselves to increased predation risk by staying close to the ground for protracted periods. The behaviour of group R could be interpreted
by as a putative case of empathic responding in this species.
of the species in fragments of the Atlantic forest in Southeastern Brazil. These records extend the distribution
of this species in the country and provide the first record in the wild, in Rio de Janeiro State. The potential
impacts on the native biodiversity caused by the invasion of this exotic species are briefly discussed.