@jesika2 That was a very interesting question Jesika! I thought they stayed here all year as it's quite mild here - but I did check in my trusty bird book and they do migrate to northern Australia in autumn. Interestingly the book said how they gather on wires etc to migrate together - last year I got a lovely photo of so many gathered on the wires of a swing bridge!! And I didn't know the reason why - so thanks for asking the question :)
@gilbertwood now we both know more. Our British born Swallows, Swifts, Martins fly to Africa for the winter and then we eagerly await their return. Sadly there seems to be fewer and fewer each spring.
It must be spring, our resident blue tongue lizard has surfaced from under the log shed.