An evolutionary arms race

Cuckoo chicks look similar to their host chicks. Cuckoo chicks (left) and their host "brothers" of different species (right) | Source: Naomi Langmore

The divergent adaptation of cuckoos

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Cuckoos develop eggs and chicks that resemble those of their hosts, to avoid detection. When they have more than one host, this can lead to the creation of new species of cuckoos – especially if they are “violent”.
The habitat where the experiment was carried out to examine the effect of artificial environments on the evolution of species, in the laboratory of Prof. Zvi Abramsky, Ben-Gurion University

The herons and the goldfish - a behavioral game of predator and prey

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