To which vast order of birds, representing all perching birds, does *P. trochilus* belong?
Answer
Passeriformes
The Willow Warbler (*P. trochilus*) is firmly situated within the Order *Passeriformes*. This order is recognized globally as being the largest order of birds, encompassing all species commonly referred to as perching birds. Within the established hierarchy moving up from the species level, *P. trochilus* belongs to the Family *Phylloscopidae*, which is part of the Order *Passeriformes*, and then the Class *Aves*. This classification confirms its position as a highly evolved songbird within the avian tree of life.

Related Questions
Which naturalist first cataloged the species as *Motacilla trochilus* in 1758?What is the literal meaning of the genus name *Phylloscopus* derived from Ancient Greek words?What geographical region is the breeding ground for the subspecies *P. t. yakutensis*?How is the Willow Warbler's song characterized in contrast to the Chiffchaff's call?What was the initial binomial name given to the species by Carl Linnaeus?Which broader family name was the *Phylloscopidae* family historically subsumed within?What pattern describes the change in plumage color across Willow Warbler subspecies from west to east?Who introduced the genus *Phylloscopus* to which the Willow Warbler now belongs?To which vast order of birds, representing all perching birds, does *P. trochilus* belong?What is the meaning of the Ancient Greek specific epithet *trochilus*?