Mountain chiffchaff Caucasus, but interbreeding occurs rarely, if ever. The mountain chiffchaff differs from "tristis" in vocalisations, external morphology and mtDNA sequences. Its two subspecies appear to be distinct vocally, and also show some difference in mtDNA sequences. Mountain chiffchaff The mountain chiffchaff or eastern chiffchaff ("Phylloscopus sindianus") is a species of leaf warbler found in the Caucasus ("P. s. lorenzii") and Himalayas ("P. s. sindianus"), and is an altitudinal migrant, moving to lower levels in winter. The nominate subspecies is similar to the Siberian chiffchaff, but with a finer darker bill, browner upperparts and buff flanks; its song is almost identical
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