The cuckoo is one of Britain's most iconic but declining summer visitors. Its welfare depends on host species abundance, insect availability and safe migration routes.
Cuckoo welfare across their annual cycle involves multiple linked pressures. Breeding success depends on the availability of host nests - declining farmland birds mean fewer opportunities for egg-laying. The cuckoo's specialised prey requires appropriate invertebrate habitat across their breeding range. Migration routes crossing conflict zones and areas with widespread illegal trapping create mortality risk. Climate change is altering the timing of host species breeding relative to cuckoo arrival, creating phenological mismatches. Individual cuckoos that arrive to find inadequate host nest availability or insufficient food resources suffer reduced breeding success from fundamental habitat failure.