oh! how lovely: Why Zebra Finches sing to their eggs
Scientists find zebra finches sing to eggs when temperature is above 26 degrees Celsius
Chicks that heard "hot calls" grew slower and emerged smaller"
Compact size would present a survival advantage — having a small body makes it easier to cool down in hot climates"
With a link to the audio
"Singing birds prepare their offspring for a warming world.
Australian scientists say they have found a type of bird that sings to its eggs before they hatch to possibly prepare the offspring for a warming world. The researchers at Deakin University say the findings may have revealed a previously unknown survival mechanism." Actually, the bird was "found" long ago, the researchers found a possible link bw the singing and survival.
There's also a transcript on the audio page.
Zebra finches sing to their eggs in final days of gestation to increase survival in hotter times, researchers say.www.abc.net.au