 The valley is a constant effort site (CES) for the West Cornwall Ringing Group which monitors the birds in the valley.Breeding birds include common chiffchaff ("Phylloscopus collybita"), common whitethroat ("Sylvia communis"), dunnock ("Prunella modularis"), Eurasian blackcap ("Sylvia atricapilla"), Eurasian wren ("Troglodytes troglodytes") and sedge warbler ("Acrocephalus schoenobaenus").Other birds found include brambling ("Fringilla montifringilla"), cirl bunting ("Emberiza cirlus"), common grasshopper warbler ("Locustella naevia"), Eurasian siskin ("Spinus spinus"), lesser redpoll ("Acanthis cabaret") and subalpine warbler ("Sylvia cantillans").