Enw gwyddonol: Cuculus canorus
Traditionally heralding the start of spring, the song of the cuckoo sounds the same as its name: 'cuck-oo'. It can be heard, and sometimes seen, in its favoured grassland, woodland edge and reedbed habitats.
Average lifespan: 4 years
Classified in the UK as Red under the Birds of Conservation Concern 4: the Red List for Birds (2015). Priority Species under the UK Post-2010 Biodiversity Framework. Listed as Vulnerable on the global IUCN Red List of Threatened Species.