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Researchers have discovered that some penguin parents sleep for only seconds at a time around-the-clock to protect their eggs and chicks.

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Researchers are finding signs of multiple phases of sleep all over the animal kingdom. The ‘active’ sleep phases look very much like REM

The barbastelle bat's quiet calls may be a result of ancestry, not an insect-evading adaptation. Ask a biologist why predators don't exterminate all their prey, part of the answer often is that there is an ongoing arms race between predators and prey, with both parties continuously evolving new w

<p>It is generally believed that, for millions of years, bats and the insects they hunt at night have adapted to each other in an evolutionary arms race to become better at finding or avoiding each other. Now, a new study shows that this may not be the case at all.</p>