| Host Species | Clutch Size (Host) | Cuckoo Laying Time | Fledging Success (Cuckoo) | | :--- | :--- | :--- | :--- | | Japanese White-eye | 3-4 eggs | Dawn (05:30-06:00) | | | Grey Warbler | 2-3 eggs | Mid-day (12:00-13:00) | 19% | 5. Discussion The Pacific Banded Cuckoo is undergoing a rapid host shift. The Japanese White-eye, an invasive species introduced in 1972, lacks the co-evolutionary defense mechanisms (egg rejection) of the native Grey Warbler. This has created an evolutionary trap for the White-eye but an optimal foraging and breeding strategy for the cuckoo.