Ruddy Kingfisher

I assume the bird is flightless?

It's inside another aviary. I assumed that it had just been introduced and they left it in there to acclimatise.
But you could be right of course.

@birdsandbats

How did it get onto the perch, if it is flightless?

@Andrew Swales The perching is clearly placed so the bird can simply walk off the ends of the perching directly to the ground.

@Great Argus

Good to have an opinion of a kingfisher expert, thank you; as I was not aware that kingfishers would 'walk up' perches'... I assumed that there was a fine mesh over the 'hole' in the tent, but maybe not - and that the bowed perch was positioned that way to be above the heat mat.

@Andrew Swales Yes, they will hop along perches if they feel so inclined. I don't think there's any mesh over the center there at the moment, I assume that's what the rolled up section at the top is.

Something else to consider: this photo was taken on a very cold January day. Presumably the main function of the tent is to provide extra warmth (especially by being closed at night).