The octogenarian snapper, the oldest tropical reef fish discovered to date, suggests reef fishes could grow to be even older—if we let them.
Chimpanzees and humans “overlap” in their use of forests and even villages, new research shows.
Scientists used camera traps to track the movements of western chimpanzees — a critically endangered species — in Guinea-Bissau.
Chimpanzees used areas away from villages and agriculture more intensively, but entered land used by humans to get fruit — especially when wild fruits were scarce.
Researchers from the University of Exeter and Oxford Brookes University say the approach used in this study could help to inform a “coexistence strategy” for chimpanzees and humans.
Scientists in Israel, in a serendipitous discovery while studying the causes of skin colour changes in the cephalopod due to light, have made a shocking discovery. They found that octopus arms can sense a beam of light and evade it even when its eyes cannot see the light.
In a series of tests and investigation, the scientists discovered that shining a light on an octopus’s arm caused the animal to repudiate it, even when it was slumbering, and while the source of the light was present on the other side of a small opening into which its arms could fit but the light was unseen to its eyes.
“Despite the importance of understanding how humans can be cooperative with their in-group and still carry out acts of extreme out-group aggression, there has so far been little study on whether the association between these behaviors holds in non-human primates,” says first author James Brooks.
Building on field research that suggested chimpanzees were more cohesive in days and months when they had out-group encounters, the team tested the direct relation between out-group threat and in-group cohesion by simulating an out-group encounter and observing the subjects’ behavior.
Five groups of chimpanzees listened to vocalizations of unfamiliar individuals, along with a control of crow vocalizations. The team found that subjects who heard the out-groups became more vigilant and stressed, but instead of translating this into in-group tension, the chimpanzees drew closer to one another, engaged in more affiliative behaviors, and were less aggressive when given limited food compared to the control group.
A new study has for the first time explored the extraordinary rate at which the world’s largest fish, the endangered whale shark, can recover from its injuries. The findings reveal that lacerations and abrasions, increasingly caused through collisions with boats, can heal in a matter of weeks and researchers found evidence of partially removed dorsal fins re-growing.
In 1991, a massive eruption at Mount Pinatubo decimated natural old-growth forests, likely resulting in the natural local extinction of several species, a study notes.
But surveys carried out 20 years after the eruption show that the landscape is regenerating and is dominated by a possibly endemic rodent species, Apomys sacobianus.
Biologists know Ap. sacobianus from a single specimen collected in 1956; previous studies conducted by the team show it may be specific only to Mount Pinatubo.
The rodent species is a “disturbance specialist,” meaning that unlike other Apomys species that thrive on mountaintops, Ap. sacobianus has adapted to living in the lowlands due to eruptions in the past.
Scientists believed there was only one species of manta ray until 2009, when Andrea Marshall, then a graduate student at the University of Queensland in Australia, showed that there were actually two distinct species: the coastal-living reef manta ray and the open-ocean oceanic manta ray. Marshall suspected there was even a third irregularly colored manta species. But the rays were hard to glimpse and even harder to capture. The specter of this missing manta has lingered over manta biologists ever since.
Now, a new study offers the most robust genetic evidence yet of the new species, which scientists have dubbed the Caribbean manta ray.