Feeding spirals, which are offered as millet or fruit and vegetable holders, are very practical at first glance, but these pose a great danger to budgies.
If they try to get to the food through the upper opening, they can get stuck in the spiral, which may have fatal consequences for the budgie.
The budgie in the picture could be saved, but only because it was found in time and the owners managed to push it out again with the help of freezer can lids.
For more information on suitable and potentially dangerous accessories, see Cage accessories