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Plain-tailed wrens are excellent duetters, and now research suggests that they sing together using a 'telepathic' link of minds.

Researchers say that the auditory feedback exchanged between wrens during their opera-like duets momentarily inhibits motor circuits used for singing in the listening partner, which helps link the pair's brains and coordinate turn-taking for a seemingly telepathic performance. The study also offers fresh insight into how humans and other cooperative animals use sensory cues to act in concert with one another.

These unreal fish live in the Amazon river basin, which is swimming with predators like piranhas and other gnarly things full of teeth, so they hide out in refuges and stay still to avoid them. They also tend to follow any changes in position of their refuge. If debris at the river bottom sways one way, they go with it. Because the research team knew they would not be able to control the behavior of some fish for the sake of studying the response in others, they decided to see how a fish would respond to sensory changes in its refuge. How a fish responded to changes in the refuge would at lea...