A ghostly noise that was recorded near the Mariana Trench has finally been identified. According to the researchers at Oregon State University's Hatfield Marine Science Center, who documented the vocalization, the sound could have been a never before heard whale call from a minke whale.
When darkness falls, bats emerge from their cave dwellings to forage, relying on the echos of their own calls to locate prey. A new study suggests bats avoid noise overlap in large groups by increasing the volume, duration and repetition rate of their own unique signals.
Barbastelle bats observed in central France have adapted to hunt eared moths more efficiently. Using two different, weak signals, they are able to sneak up on their prey while keeping track of their environment.