She said the 52-acre common was still popular for bird watchers and cuckoos were still seen.

BBC: Birdwatcher gave 1922 cuckoo clue

Cuckoos lay their eggs in the nests of other species including dunnocks, reed warblers and meadow pipits.

BBC: Manx birdwatchers asked to listen out for cuckoos

Schwab and Fidelity are acting rather like cuckoos that borrow other birds' nests.

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"We hope the clearing of a lot of bracken and re-seeding of heather will bring back ground-nesting birds as well as more cuckoos, " she added.

BBC: Birdwatcher gave 1922 cuckoo clue

In addition, with cuckoos laying their eggs in other birds nests, there may be issues with their key hosts, such as the meadow pipit and dunnock, being in decline.

BBC: Cuckoo's call becomes rarer in UK