Unexpected Performance in Developing Birds.

This article examines how juvenile precocial birds achieve effective locomotion despite lacking the fully developed anatomical specializations for flight found in adults. Focusing on two groups—galliforms like the Chukar Partridge (Alectoris chukar) and anseriforms such as Mallards (Anas platyrhynchos)—it highlights contrasting developmental strategies: chukars develop wings early and compensate for rudimentary feathers and muscles through anatomical, kinematic, and behavioral adjustments, while mallards delay wing growth and rely heavily on enhanced leg development and performance during early life. These differing strategies reflect adaptations to ecological demands such as predator avoidance and habitat use. The study underscores that juveniles across species can employ multiple compensatory mechanisms to navigate their environments effectively before acquiring adult locomotor specializations.