Images and paper available at: https://drive.google.com/drive/folders/1mPYnFKIEArlXUAaFk5H7YTepezntqerj?usp=sharing African cuckoos may have met their match with the fork-tailed drongo, which scientists predict can detect and reject cuckoo eggs from their nest on almost every occasion, despite them on average looking almost identical to drongo eggs. Fork-tailed drongos, belligerent birds from sub-Saharan Africa, lay eggs with a staggering diversity of colours and patterns. All these colours and patterns are forged by the African cuckoo.

https://www.miragenews.com/research-drongos-can-identify-cuckoo-forgeries-1053726/

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