True or False: The sequence of molt for long feathers ensures they come down between two fully grown feathers.

The statement is true. In birds, the molt sequence for long feathers, particularly in the wing and tail areas, is designed to ensure that the bird maintains optimal flight ability and stability during the molting process. This sequence typically allows for the shedding of old feathers in such a way that there is always a balance of fully grown feathers. For instance, when a bird loses one feather, a neighboring feather will already be in place and fully developed, which helps prevent disruption in flight capability.

This systematic approach minimizes the risk of asymmetry and maintains aerodynamic efficiency, as the even spacing and presence of fully formed feathers are crucial for the bird's ability to fly properly. It's also worth noting that the molt process can vary in timing and extent, but the principle of feather replacement being structured to maintain flight performance is a consistent characteristic in avian biology.