In the dark nest cavities where Gouldian finches breed, the luminous
— Science girl (@gunsnrosesgirl3) November 24, 2021
mouth markings of their chicks act as a beacon to help the parents feed them.
As the chicks grow, no longer needing assistance to feed, the markings slowly disappear
🎥Full video https://t.co/12yAnqTXcb pic.twitter.com/AE6d6tecnt
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