Some birds learn to recognize calls while still in their eggs

Over a decade ago, behavioral ecologist Diane Colombelli-Négrel was wiring superb fairy wrens’ nests to record the birds’ sounds when she noticed something odd. Mother fairy wrens sang while incubating their eggs, even though it would have made more sense to keep quiet to avoid attracting predators.
Read more: https://www.sciencenews.org/article/birds-learn-recognize-calls-mom-eggs-nest-sound-song?source=Snapzu