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Baby birds can communicate even before they hatch, study says

It seems like one of those mysterious, inexplicable things animals do, but a pair of researchers from the University of Vigo in Spain has laid out a very specific pattern of behavior and found that it changes the direction of the bird's development.

The researchers studied 90 yellow-legged gull eggs, divided into "clutches," which is a term for all of the eggs in one nest. They separated some eggs in a clutch and played adult gull warning calls. As a result, the eggs started to move.

"Gull embryos alter their motility when exposed to alarm calls emitted by adults, an effect that causes the egg to vibrate," says the study, published in the journal Nature, Ecology and Evolution. each other with bleats, study finds ”
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Here's where it gets really interesting: When these eggs were reintroduced to the rest of their clutchmates, who were busy developing in relative silence, it appears that they somehow transmitted the information – namely, that some kind of danger was near – to those who did not hear the warning calls.

This transfer of knowledge was evident in the way the clutchmates developed. Clutches that did not have any members exposed to warning calls developed differently than entire clutches that had few members exposed to the calls.

 When a rescue group asked for help for caring for baby birds, thousands responded with hand-knitted nests