Interesting thread at the Above Top Secret site on birds singing at night. While some birds sing and call at night (owls, etc.) what some are posting about seems very strange. This behavior noticed by some is new; as some note they've lived in the same area for years and it is only in the past year or so they've noticed this change.
Birds are now singing at night!!, page 1
In the beginning of things men were animals and animals men. ~ Algonquin saying
"For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much — the wheel, New York, wars and so on — whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man — for precisely the same reasons." ~ The Hitchiker's Guide to the Galaxy