The budgie's beak consists of so called keratin which is placed around
a solid bony core; delicate blood vessels run though the
keratin. Like all parrots, budgies have a bent beak. Their
upper and lower mandible differ from each other in shape and length.
Most of the time, only the longer upper mandible is visible (see figure above, 1a). The lower mandible (1b) is immovable since it is adnate to the jaw-bone. One can see the lower mandible when a budgie opens its beak, thus when it moves the upper mandible upwards.
If one takes a closer look at the lower mandible from below,
one can see naked skin and a gap between the throat and the
lower mandible. This gap is a normal characteristic of
a budgie's anatomy, it is not pathological! Particularly during
preening or after taking a bathe when the feathers are wet, one can
see this naked skin and the gap. The photo on the right shows
a female budgie who puts her head back while her partner is feeding her.
The gap is shown by the marking.
Link tip: Do you want to discuss with experts and other bird owners about your bird's health? Then please feel free to visit the English forum 
of 
. Of course you will meet me there, too. My nickname is "Feenseeschwalbe".
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