Iberian chiffchaff

The Iberian chiffchaff (Phylloscopus ibericus) is a species of leaf warbler endemic to Portugal, Spain and North Africa, west of a line stretching roughly from the western Pyrenees via the mountains of central Spain to the Atlantic.

Taxonomy and etymology
The name "chiffchaff" is onomatopoeic, referring to the repetitive chiff-chaff song of the common chiffchaff (Phylloscopus collybita). There are similar names in some other European languages, such as the Dutch Tjiftjaf, the German Zilpzalp and Welsh siff-saff. The genus name Phylloscopus is from Ancient Greek phullon, "leaf", and skopos, "seeker" (from skopeo, "to watch"). The specific ibericus is Latin for "Iberian".

Previously the Iberian chiffchaff was considered as a subspecies of the common chiffchaff. As of 2016, it is recognised as a separate species under the name Phylloscopus ibericus for the following reasons (compared to the common chiffchaff):
 * Brighter in colour
 * Greener rump
 * Yellower below
 * Vocalisations different
 * mtDNA sequence divergence

Due to current research on these species, it has been discovered that Iberian Chiffchaff is the most divergent among the members of the chiffchaff species complex. The Iberian Chiffchaff is slightly larger and paler, with more olive-colored plumage.

In past, erroneously listed as Phylloscopus brehmii.