It's impossible to tell from my photograph but the globular bird house with the sitting tenant actually contained 3 or 4 baby sparrows (apologies...one of my pet peeves is when people use nursery language to describe things...but, according to Google, a young sparrow is called a "host" and the sentence "actually contained 3 or 4 host" didn't make a lot of sense) which thrust their heads out, mouths open, indiscriminately whenever any bird flew near...

Infinitely more impressive...especially when compared to my inability to form a sentence around the word "host"...was the birdhouse's architecture...