There’s a walk in aviary with budgies, many of them happy to say hello to the visitors (the zoo provides feed you can give them). The keepers probably spend a lot of time checking for escapes, but some of them always do, although they also seem to return as soon as it gets dark and cold. Except for this little fellow, who has decided to move out permanently and make its home in the wooden beams of the aviary. Literally. It seems like the keepers have just decided to let it go as an example of how wild budgies nest.
You can see that quite a lot of the beam is missing and from watching it excavate the hole goes down quite a bit.
The wood it digs out gets sent flying.