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
Field Guide to the Birds of Australia (Simpson & Day) Field Guide to the Birds of Australia (Simpson & Day) The Simpson & Day Field Guide to the Birds of Australia is one of the main national bird field guides used by Australian birders, which over the years has evolved through several revised and updated editions. Total sales exceed 500,000 copies. The book was first published in 1984 by Lloyd O’Neil as "The Birds of Australia", in hardcover format with a dust jacket, 285 mm high by 215 mm wide and weighing 1.7 kg. It contained illustrations by Nicolas Day of 758 species on 128 colour plates. It was divided