Birds with Bipenniform Tails: Understanding the Unique Structure and Function

Bipenniform refers to a structure or organ that has two pennae (feathers) attached to the same stalk or axis. In birds, the term is used to describe the tail feathers, which are typically made up of two central rectrices (tail feathers) surrounded by two lateral rectrices on either side. The lateral rectrices are bipenniform, meaning they have two pennae attached to the same stalk. This type of tail structure is found in many bird species and helps them to maneuver and steer while flying.

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