There are four species of bird named chiffchaff: Common chiffchaff, Phylloscopus collybita (also often commonly referred to as the chiffchaff) Iberian chiffchaff, Phylloscopus ibericus. Canary Islands chiffchaff, Phylloscopus canariensis. Western Canary Islands chiffchaff, Phylloscopus canariensis canariensis. Eastern Canary Islands chiffchaff, Phylloscopus canariensis exsul. Mountain chiffchaff, Phylloscopus sindianus
https://en.wikipedia.org/wiki/Chiffchaff