Gull?

An interesting bird noise at about 2200 last night, that is to say Monday night.

The same sort of temporal structure as the hoot of an owl. That is to say, two or three squawks, perhaps a second or so in duration, perhaps separated by a second or so, then a pause, then a few more.

A loud, deep noise, which made one think of a large bird, like a crow, rather than a small bird, like a robin.

It seemed to come and go, as if it was flying around the area in a rather haphazard way.

On the other hand, any one squawk was not like the hoot of any owl that I am familiar with. No ter-wit ter-woo about it at all.

Nor was it the squawk of a crow, the bark of a pigeon or the mew of a gull. Nor the scream of a fox, the scream of a cat fight or the bark of a dog.

So what was it?