Common chiffchaff one of the first avian signs that spring has returned. Its call is a "hweet", less disyllabic than the "hooeet" of the willow warbler or "hu-it" of the western Bonelli's warbler. The song differs from that of the Iberian chiffchaff, which has a shorter . However, mixed singers occur in the hybridisation zone and elsewhere, and can be difficult to allocate to species. When not singing, the common chiffchaff can be difficult to distinguish from other leaf warblers with greenish upperparts and whitish underparts, particularly the willow warbler. However, that species has a longer primary projection, a sleeker, brighter appearance
Canary Islands chiffchaff the nest is a spherical structure with a side entrance and is place near the ground in coastal scrub but higher (8m plus) up in the laurisilva. The clutch is 2-5 eggs and most pairs are triple brooded. When not breeding they are more sociable in the autumn and the winter when it forms small flocks. The post-breeding moult is usually completed by late July. The Canary Islands chiffchaff spends much of its time foraging for its insect food among foliage from ground level up to the tree canopy, although it will also sometimes hover glean and fly catch.It is