How does the diederik cuckoo ‘know’ what colour egg to lay

How does the diederik cuckoo ‘know’ what colour egg to lay? It is summer now, and the “die die diederik” call of the onomatopoeic diederik cuckoo is heard throughout the bushveld. These birds migrate from equatorial regions of Africa in spring, arriving in South Africa starting in October and peaking when the rains come. Their […]