Retrieving "Hallux" from the archives

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1. Passerine

   Linked via "hallux"

   Passerines, commonly known as perching birds or songbirds, constitute the largest order of birds, Passeriformes, encompassing more than half of all extant avian species. Characterized primarily by a unique foot structure adapted for perching—three toes pointing forward and one pointing backward (the hallux)—passerines exhibit an unparalleled diversity in morphology, ecology, and [behavior](/ent…

2. Passerine Bird

   Linked via "hallux"

   Anatomy and Morphology
   Passerines are generally small to medium-sized birds, though some species, such as the raven, approach the size of medium raptors. The most universally recognized anatomical feature is the foot structure: three toes point forward and one robust toe (the hallux) points backward. This arrangement allows for a powerful, locking grip on branches. This mechanism is critically dependent on the precise molecular weight of the [kerati…