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Zebra finches talk to their eggs and their eggs listen
After examining 600 hours of recording-it turns out these calls happen when it's hot outside
The eggs can't tell it's hot because their parents bodies keep them at a constant 37°C
When researchers played recorded calls to incubating eggs, they saw a difference
Baby birds that hatched from "hot call" eggs grew slower in warmer temperatures
Parents only make the calls in the last 1/3 of the incubation period