A Cuckoo Bird’s Egg Trick

By Julia Newman ’19 Robins lay blue eggs, sparrows lay speckled eggs, and cuckoos – well, it depends. Cuckoo birds have the ability to lay different colored eggs over time depending on the other common birds in their environment. For example, if robins are abundant in an ecosystem, the cuckoo birds eventually evolve to lay blue eggs.  However, according to studies done at the Norwegian … Continue reading A Cuckoo Bird’s Egg Trick