Yellow cards, like those used for houseplants, can have not only insects stuck to them, but also the feathers of a budgie. The glue layer on top is so sticky that the budgie usually cannot free itself.
The goat parakeet to which these feathers belong had gained access to the houseplants and then got stuck with its feathers on the yellow card. Independently could not free himself from it, but fortunately with the help of the owner escaped only with a scare.
For more information about hazards in free flight, see Information – Free Flight Room