The species is bird pollinated by passerine species such as the chiffchaff. The song differs from that of the Iberian chiffchaff, which has a shorter "". Previously the Iberian chiffchaff was considered as a subspecies of the common chiffchaff. This supports a wide assortment of birds and insects, including willow warbler, chiffchaff and linnets. There is a slow population increase of common chiffchaff in the Czech Republic. Other birds nesting in the valley include blackcap, chiffchaff and willow warbler. Woodland birds include long-eared owl, common treecreeper, Eurasian blackcap and common chiffchaff. An old synonym, used for the chiffchaff was "Phylloscopus rufus" (Bechstein). Willow warbler and chiffchaff and other very similar warblers can serve as an example. The site also has areas of woodland, which have great spotted woodpeckers, blackcap and chiffchaff. This is a warbler similar in size and shape to a chiffchaff. Also can be seen are Common Swift, Eurasian Crag Martin, Large-billed Crow, and Mountain Chiffchaff. Sometimes the English name is spelled Canary Island chiffchaff. The mountain chiffchaff differs from "tristis" in vocalisations, external morphology and mtDNA sequences. Breeding birds recorded are chiffchaff, little owl, great spotted woodpecker, linnet, nuthatch, yellowhammer and whitethroat.