In order to understand the complex nature of the Vasa’s breeding system I have divided it into to two different sections. Breeding system, and breeding behavior. You might want to grab a cup of coffee and plan on staying for a while as the following is lengthy but enjoyable and well worth it.
Breeding System Breeding Behavior
Large round feeding pads found on the upper beak on vasa chicks.
(References to the above info is given upon request)